2003 Dodge RAM Standard Owners Manual

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lamp-on or lamp-off messages to the instrument clus- ter. If the CAB sends a lamp-on message after the bulb test, it indicates that the CAB has detected a system malfunction and/or that the ABS system has become inoperative. The CAB will store a Diagnostic Trouble Code (DTC) for any malfunction it detects. Each time the ABS indicator fails to light due to an open or short in the cluster ABS indicator circuit, the cluster sends a message notifying the CAB of the condition, then the instrument cluster and the CAB will each store a DTC. For proper diagnosis of the antilock brake system, the CAB, the PCI data bus, or the electronic message inputs to the instrument clus- 8J - 18 INSTRUMENT CLUSTER ABS INDICATOR (Continued) ter that control the ABS indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. AIRBAG INDICATOR DESCRIPTION An airbag indicator is standard equipment on all instrument clusters. However, the instrument cluster can be programmed to disable this indicator on vehi- cles that are not equipped with the airbag system, which is not available in some markets. The airbag indicator is located near the upper edge of the instru- ment cluster, between the tachometer and the speed- ometer. The airbag indicator consists of a stencil-like cutout of the words “AIR BAG” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. A red Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the “AIR BAG” text to appear in red through the translucent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The air- bag indicator is serviced as a unit with the instru- ment cluster. OPERATION The airbag indicator gives an indication to the vehicle operator when the airbag system is faulty or inoperative. The airbag indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and electronic mes- sages received by the cluster from the Airbag Control Module (ACM) over the Programmable Communica- tions Interface (PCI) data bus. The airbag indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) cir- cuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the airbag indicator for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position the airbag indicator is illu- minated for about six seconds. The entire six second bulb test is a function of the ACM. † ACM Lamp-On Message - Each time the clus- ter receives a lamp-on message from the ACM, the airbag indicator will be illuminated. The indicator DR is indicator illuminated. The remains illuminated for about twelve seconds or until the cluster receives a lamp-off message from the ACM, whichever is longer. † Communication Error - If the cluster receives no airbag messages for three consecutive seconds, the airbag indicator remains illuminated until the cluster receives a sin- gle lamp-off message from the ACM. † Actuator Test - Each time the cluster is put through the actuator test, the airbag indicator will be turned on, then off again during the bulb check por- tion of the test to confirm the functionality of the LED and the cluster control circuitry. The actuator test illumination of the airbag indicator is a function of the instrument cluster. The ACM continually monitors the airbag system circuits and sensors to decide whether the system is in good operating condition. The ACM then sends the proper lamp-on or lamp-off messages to the instru- ment cluster. If the ACM sends a lamp-on message after the bulb test, it indicates that the ACM has detected a system malfunction and/or that the air- bags and seat belt tensioners may not deploy when required, or may deploy when not required. The ACM will store a Diagnostic Trouble Code (DTC) for any malfunction it detects. Each time the airbag indicator fails to illuminate due to an open or short in the cluster airbag indicator circuit, the cluster sends a message notifying the ACM of the condition, the instrument cluster and the ACM will each store a DTC, and the cluster will flash the seatbelt indicator on and off as a backup to notify the vehicle operator. For proper diagnosis of the airbag system, the ACM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the airbag indica- tor, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. BRAKE/PARK BRAKE INDICATOR DESCRIPTION A brake indicator is standard equipment on all instrument clusters. The brake indicator is located near the lower edge of the instrument cluster, between the tachometer and the speedometer. The brake indicator consists of stencil-like cutouts of the word “BRAKE” and the International Control and Display Symbol in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. A red Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the “BRAKE” text and the icon to appear in red through icon for “Brake Failure” DR BRAKE/PARK BRAKE INDICATOR (Continued) INSTRUMENT CLUSTER 8J - 19 the translucent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster elec- tronic circuit board. The brake indicator is serviced as a unit with the instrument cluster. OPERATION upon board based cluster (run-start) circuit. Therefore, The brake indicator gives an indication to the vehi- cle operator when the parking brake is applied, when there are certain brake hydraulic system malfunc- tions as indicated by a low brake hydraulic fluid level condition, or when the brake fluid level switch is dis- connected. The brake indicator can also give an indi- cation when certain faults are detected in the Antilock Brake System (ABS). This indicator is con- trolled by a transistor on the instrument cluster cir- cuit programming, electronic messages received by the cluster from the Controller Antilock Brake (CAB) over the Program- mable Communications Interface (PCI) data bus, and a hard wired input from the park brake switch. The brake indicator Light Emitting Diode (LED) is com- pletely controlled by the instrument cluster logic cir- cuit, and that logic will only allow this indicator to operate when the instrument cluster receives a bat- tery current input on the fused ignition switch out- put the LED will always be off when the ignition switch is in any posi- tion except On or Start. The LED only illuminates when it is provided a path to ground by the instru- ment cluster transistor. The instrument cluster will turn on the brake indicator for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position the brake indicator is illu- minated by the instrument cluster for about two sec- onds as a bulb test. † Brake Lamp-On Message - Each time the cluster receives a lamp-on message from the CAB, the brake indicator will be illuminated. The CAB can also send brake lamp-on messages as feedback dur- ing ABS diagnostic indicator remains illuminated until the cluster receives a lamp-off message from the CAB, or until the ignition switch is turned to the Off position, whichever occurs first.† Park Brake Switch Input - Each time the cluster detects ground on the park brake switch sense circuit (park brake switch closed = park brake applied or not fully released) while the ignition switch is in the On position, the brake indicator flashes on and off. The indicator continues to flash until the park brake switch sense input to the cluster is an open circuit (park brake switch open = park brake fully released), or until the ignition switch is turned to the Off position, whichever occurs first. procedures. The † Actuator Test - Each time the instrument clus- ter is put through the actuator test, the brake indi- cator will be turned on, then off again during the bulb check portion of the test to confirm the function- ality of the LED and the cluster control circuitry. The park brake switch on the park brake pedal mechanism provides a hard wired ground input to the instrument cluster circuitry through the park brake switch sense circuit whenever the park brake is applied or not fully released. The CAB continually monitors the ABS system circuits and sensors, including the brake fluid level switch on the brake master cylinder reservoir, to decide whether the sys- tem is in good operating condition. The CAB then sends the proper lamp-on or lamp-off messages to the instrument cluster. If the CAB sends a lamp-on mes- sage after the bulb test, it indicates that the CAB has detected a brake hydraulic system malfunction and/or that the ABS system has become inoperative. The CAB will store a Diagnostic Trouble Code (DTC) for any malfunction it detects. For further diagnosis of the brake indicator or the instrument cluster circuitry that controls the LED, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUS- TER - DIAGNOSIS AND TESTING). The park brake switch input to the instrument cluster can be diag- nosed using conventional diagnostic tools and meth- ods. For proper diagnosis of the brake fluid level switch, the ABS, the CAB, the PCI data bus, or the electronic message inputs to the instrument cluster that control the brake indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic infor- mation. DIAGNOSIS AND TESTING - BRAKE INDICATOR The diagnosis found here addresses an inoperative brake indicator condition. If there are problems with several indicators in the instrument cluster, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAG- NOSIS AND TESTING). If the brake indicator stays on with the ignition switch in the On position and the park brake released, or comes on while driving, the brake system must be diagnosed and repaired prior to performing the following tests. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING). If no brake system problem is found, the following procedures will help to locate a shorted or open circuit, or a faulty park brake switch input. Refer to the appropri- ate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connec- tors, splices and grounds. INSTRUMENT CLUSTER 8J - 20 BRAKE/PARK BRAKE INDICATOR (Continued) DR WARNING: ON VEHICLES EQUIPPED WITH AIR- BAGS, DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, DRIVER AIRBAG, PASSENGER AIRBAG, SEAT BELT TENSIONER, SIDE CURTAIN AIRBAG, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCON- NECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO TAKE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY. THE INDICATOR ILLUMINATES DURING BULB TEST, BUT DOES NOT WHEN PARK BRAKE APPLIED (1) Disconnect and isolate the battery negative cable. Disconnect the body wire harness connector for the park brake switch from the switch terminal. Apply the parking brake. Check for continuity between the park brake switch terminal and a good ground. There should be continuity. If OK, go to Step 2. If not OK, replace the faulty park brake switch. (2) Disconnect the instrument panel wire harness connector (Connector C1) for the instrument cluster from the cluster connector receptacle. Check for con- tinuity between the park brake switch sense circuit cavities of the body wire harness connector for the park brake switch and the instrument panel wire harness connector for the instrument cluster. There should be continuity. If not OK, repair the open park brake switch sense circuit between the park brake switch and the instrument cluster as required. INDICATOR REMAINS ILLUMINATED - BRAKE SYSTEM CHECKS OK (1) Disconnect and isolate the battery negative cable. Disconnect the body wire harness connector for the park brake switch from the switch terminal. Check for continuity between the terminal of the park brake switch and a good ground. There should be no continuity with the park brake released, and continuity with the park brake applied. If OK, go to Step 2. If not OK, replace the faulty park brake switch. (2) Disconnect the instrument panel wire harness connector (Connector C1) for the instrument cluster from the cluster connector receptacle. Check for con- tinuity between the park brake switch sense circuit cavity of the body wire harness connector for the park brake switch and a good ground. There should be no continuity. If not OK, repair the shorted park brake switch sense circuit between the park brake switch and the instrument cluster as required. CARGO LAMP INDICATOR DESCRIPTION A cargo lamp indicator is standard equipment on all instrument clusters. The cargo lamp indicator is located on the right side of the instrument cluster, to the right of the oil pressure gauge. The cargo lamp indicator consists of a stencil-like cutout of the words “CARGO LAMP” in the opaque layer of the instru- ment cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly vis- ible when it is not illuminated. An amber Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the “CARGO LAMP” text to appear in amber through the translu- cent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is sol- dered onto the instrument cluster electronic circuit board. The cargo lamp indicator is serviced as a unit with the instrument cluster. OPERATION The cargo lamp indicator gives an indication to the vehicle operator when the exterior cargo lamp is illu- minated. This indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming, a hard wired multiplex input received by the cluster from the headlamp panel lamps dimmer switch on the headlamp dimmer switch mux circuit, and electronic unlock request messages received from the optional Remote Keyless Entry (RKE) receiver module. The cargo lamp indica- tor Light Emitting Diode (LED) is completely con- trolled by the instrument cluster logic circuit, and that logic will allow only this indicator to operate whenever the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the cargo lamp indicator for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position the cargo lamp indicator is illuminated for about two seconds as a bulb test. † Cargo Lamp-On Input - Each time the cluster detects a cargo lamp-on input from the headlamp switch on the headlamp dimmer switch mux circuit, the cargo lamp and the cargo lamp indicator will be illuminated. The cargo lamp and indicator remain illuminated until the cluster receives a cargo lamp-off DR CARGO LAMP INDICATOR (Continued) input from the headlamp switch, or until the ignition switch is turned to the Off position, whichever occurs first.† Actuator Test - Each time the cluster is put through the actuator test, the cargo lamp indicator will be turned on, then off again during the bulb check portion of the test to confirm the functionality of the LED and the cluster control circuitry. The instrument cluster continually monitors the headlamp dimmer switch circuit to determine the proper interior lamps features and panel lamps illu- mination levels to provide. The cluster then energizes and de-energizes a low side driver circuit to control the exterior cargo lamp. Each time the instrument cluster energizes the cargo lamp driver and the igni- tion switch is in the On or start positions, the cluster also turns on the cargo lamp indicator. For further diagnosis of the cargo lamp indicator or the instru- ment cluster circuitry that controls the indicator, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUS- TER - DIAGNOSIS AND TESTING). For proper diagnosis of the cargo lamp or the headlamp switch inputs to the instrument cluster that control the cargo lamp indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. CHECK GAUGES INDICATOR DESCRIPTION A check gauges indicator is standard equipment on all instrument clusters. On vehicles equipped with a gasoline engine, the check gauges indicator is located near the lower edge of the instrument cluster, between the tachometer and the speedometer. On vehicles equipped with a diesel engine, the check gauges indicator is located on the left side of the instrument cluster, to the left of the voltage gauge. The check gauges indicator consists of a stencil-like cutout of the words “CHECK GAGES” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. A red Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the “CHECK GAGES” text to appear in red through the translu- cent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is sol- dered onto the instrument cluster electronic circuit board. The check gauges indicator is serviced as a unit with the instrument cluster. OPERATION The check gauges indicator gives an indication to the vehicle operator when certain instrument cluster gauge readings reflect a condition requiring immedi- INSTRUMENT CLUSTER 8J - 21 ate attention. This indicator is controlled by a tran- sistor on the instrument cluster circuit board based upon cluster programming and electronic messages received by the cluster from the Powertrain Control Module (PCM) on vehicles equipped with a gasoline engine, or from the Engine Control Module (ECM) on vehicles equipped with a diesel engine over the Pro- grammable Communications Interface (PCI) data bus. The check gauges indicator Light Emitting Diode (LED) is completely controlled by the instru- ment cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the check gauges indicator for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position the check gauges indicator is illuminated for about two seconds as a bulb test. † Engine Temperature High Message - Each time the cluster receives a message from the PCM or ECM indicating the engine coolant temperature of a gasoline engine is about 122° C (252° F) or higher, or of a diesel engine is about 112° C (233° F) or higher, the check gauges indicator will be illuminated. The indicator the cluster receives a message from the PCM or ECM indicating that the engine coolant temperature of a gasoline engine is below about 122° C (252° F), or of a diesel engine is below about 112° C (233° F), or until the ignition switch is turned to the Off position, which- ever occurs first. † Engine Oil Pressure Low Message - Each time the cluster receives a message from the PCM or ECM indicating the engine oil pressure is about 41 kPa (6 psi) or lower, the check gauges indicator will be illuminated. The indicator remains illuminated until the cluster receives a message from the PCM or ECM indicating that the engine oil pressure is above about 41 kPa (6 psi), or until the ignition switch is turned to the Off position, whichever occurs first. The cluster will only turn the indicator on in response to an engine oil pressure low message if the engine speed is greater than zero. † System Voltage Low (Charge Fail) Message - Each time the cluster receives a message from the PCM or ECM indicating the electrical system voltage is less than about 11.5 volts (charge fail condition), the check gauges indicator will be illuminated. The indicator the cluster receives a message from the PCM or ECM indicating the electrical system voltage is greater than about illuminated until illuminated until remains remains INSTRUMENT CLUSTER 8J - 22 CHECK GAUGES INDICATOR (Continued) 12.0 volts (but less than 16.0 volts), or until the igni- tion switch is turned to the Off position, whichever occurs first. † System Voltage High Message - Each time the cluster receives a message from the PCM or ECM indicating the electrical system voltage is greater than about 16.0 volts, the check gauges indicator will be illuminated. The indicator remains illuminated until the cluster receives a message from the PCM or ECM indicating the electrical system voltage is less than about 15.5 volts (but greater than 11.5 volts), or until the ignition switch is turned to the Off position, whichever occurs first. † Actuator Test - Each time the cluster is put through the actuator test, the check gauges indicator will be turned on, then off again during the bulb check portion of the test to confirm the functionality of the LED and the cluster control circuitry. On vehicles with a gasoline engine, the PCM con- tinually monitors the engine temperature, oil pres- sure, and electrical system voltage, then sends the proper messages to the instrument cluster. On vehi- cles with a diesel engine, the ECM continually mon- itors the engine temperature, oil pressure, and electrical system voltage, then sends the proper mes- sages to the instrument cluster. For further diagnosis of the check gauges indicator or the instrument clus- ter circuitry that controls the LED, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNO- SIS AND TESTING). For proper diagnosis of the PCM, the ECM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the check gauges indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic infor- mation. CRUISE INDICATOR DESCRIPTION clusters. However, A cruise indicator is standard equipment on all instrument on vehicles not equipped with the optional speed control system, this indicator is electronically disabled. The cruise indica- tor consists of the word “CRUISE”, which appears in the lower portion of the gear selector indicator Vacu- um-Fluorescent Display (VFD) unit. The VFD is sol- dered onto the cluster electronic circuit board and is visible through a window with a smoked clear lens located on the lower edge of the speedometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents the indicator from being clearly visible when it illuminated. The word “CRUISE” appears in a blue-green color and at the same lighting level as the gear selector indicator information when it is illuminated by the instrument is not DR cluster electronic circuit board. The cruise indicator is serviced as a unit with the VFD in the instrument cluster. OPERATION The cruise indicator gives an indication to the vehi- cle operator when the speed control system is turned On, regardless of whether the speed control is engaged. This indicator is controlled by the instru- ment cluster circuit board based upon cluster pro- gramming and electronic messages received by the cluster from the Powertrain Control Module (PCM) over the Programmable Communications Interface (PCI) data bus. The cruise indicator is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery cur- rent input on the fused ignition switch output (run- start) circuit. Therefore, the indicator will always be off when the ignition switch is in any position except On or Start. The indicator only illuminates when it is switched to ground by the instrument cluster cir- cuitry. The instrument cluster will turn on the cruise indicator for the following reasons: † Cruise Lamp-On Message - Each time the cluster receives a cruise lamp-on message from the PCM indicating the speed control system has been turned On, the cruise indicator is illuminated. The indicator the cluster receives a cruise lamp-off message from the PCM or until the ignition switch is turned to the Off position, whichever occurs first. † Actuator Test - Each time the cluster is put through the actuator test, the cruise indicator will be turned on, then off again during the VFD portion of the test to confirm the functionality of the VFD and the cluster control circuitry. illuminated until remains The PCM continually monitors the speed control switches to determine the proper outputs to the speed control servo. The PCM then sends the proper cruise indicator lamp-on and lamp-off messages to the instrument cluster. For further diagnosis of the cruise indicator or the instrument cluster circuitry that controls the indicator, (Refer to 8 - ELECTRI- CAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the speed control system, the PCM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the cruise indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. DR INSTRUMENT CLUSTER 8J - 23 DOOR AJAR INDICATOR DESCRIPTION indicator clusters. The door ajar A door ajar indicator is standard equipment on all instrument is located on the right side of the instrument cluster, to the right of the engine temperature gauge. The door ajar indicator consists of a stencil-like cutout of the words “DOOR AJAR” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. A red Light Emit- ting Diode (LED) behind the cutout in the opaque layer of the overlay causes the “DOOR AJAR” text to appear in red through the translucent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The door ajar indicator is serviced as a unit with the instru- ment cluster. OPERATION (run-start) The door ajar indicator gives an indication to the vehicle operator that one or more of the passenger compartment doors may be open or not completely latched. This indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and hard wired inputs received by the cluster from the door ajar switches located in each door latch unit. The door ajar indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit, and that logic will allow this indicator to operate whenever the instru- ment cluster receives a battery current input on the fused ignition switch output circuit. Therefore, the LED will always be off when the igni- tion switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the door ajar indica- tor for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position the door ajar indicator is illuminated for about two seconds as a bulb test. † Door Ajar Switch Input - Each time the clus- ter detects ground on any one of the door ajar switch sense circuits (door ajar switch closed = door is open or not completely latched) the door ajar indicator will be illuminated. The indicator remains illuminated until all of the door ajar switch sense inputs to the cluster are an open circuit (door ajar switch open = door fully closed), or until the ignition switch is turned to the Off position, whichever occurs first. † Actuator Test - Each time the cluster is put through the actuator test, the door ajar indicator will be turned on, then off again during the bulb check portion of the test to confirm the functionality of the LED and the cluster control circuitry. The instrument cluster continually monitors the door ajar switches to determine the status of the doors. For further diagnosis of the door ajar indicator or the instrument cluster circuitry that controls the indicator, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the door ajar switches and cir- cuits, (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - INTERIOR/DOOR AJAR SWITCH - DIAGNOSIS AND TESTING). ENGINE TEMPERATURE GAUGE DESCRIPTION An engine coolant temperature gauge is standard equipment on all instrument clusters. The engine coolant temperature gauge is located in the lower right quadrant of the instrument cluster, below the oil pressure gauge. The engine coolant temperature gauge consists of a movable gauge needle or pointer controlled by the instrument cluster circuitry and a fixed 90 degree scale on the cluster overlay that reads left-to-right from “C” (or Cold) to “H” (or Hot) for gasoline engines. On vehicles with a diesel engine, the scale reads from “60”° C to “120”° C in markets where a metric instrument cluster is speci- fied, or from “140”° F to “245”° F in all other mar- kets. An International Control and Display Symbol icon for “Engine Coolant Temperature” is located on the cluster overlay, directly below the left end of the gauge scale. The engine coolant temperature gauge graphics are black against a white field except for two red graduations at the high end of the gauge scale, making them clearly visible within the instru- ment cluster in daylight. When illuminated from behind by the panel lamps dimmer controlled cluster illumination lighting with the exterior lamps turned On, the black graphics appear blue and the red graphics still appear red. The orange gauge needle is internally illuminated. Gauge illumination is pro- vided by replaceable incandescent bulb and bulb holder units located on the instrument cluster elec- tronic circuit board. The engine coolant temperature gauge is serviced as a unit with the instrument clus- ter. OPERATION The engine coolant temperature gauge gives an indication to the vehicle operator of the engine cool- ant temperature. This gauge is controlled by the instrument cluster circuit board based upon cluster programming and electronic messages received by INSTRUMENT CLUSTER 8J - 24 ENGINE TEMPERATURE GAUGE (Continued) DR the cluster from the Powertrain Control Module (PCM) on vehicles equipped with a gasoline engine, or from the Engine Control Module (ECM) on vehi- cles equipped with a diesel engine over the Program- mable Communications Interface (PCI) data bus. The engine coolant temperature gauge is an air core mag- netic unit that receives battery current on the instru- ment cluster electronic circuit board through the fused ignition switch output (run-start) circuit when- ever the ignition switch is in the On or Start posi- tions. The cluster is programmed to move the gauge needle back to the low end of the scale after the igni- tion switch is turned to the Off position. The instru- ment cluster circuitry controls the gauge needle position and provides the following features: † Engine Temperature Message - Each time the cluster receives a message from the PCM or ECM indicating the engine coolant temperature is between the low end of normal [about 54° C (130° F) for gas- oline engines, or about 60° C (140° F) for diesel engines] and the high end of normal [about 122° C (252° F) for gasoline engines, or about 116° C (240° F) for diesel engines], the gauge needle is moved to the actual relative temperature position on the gauge scale.† Engine Temperature Low Message - Each time the cluster receives a message from the PCM or ECM indicating the engine coolant temperature is below the low end of normal [about 54° C (130° F) for gasoline engines, or about 60° C (140° F) for diesel engines], the gauge needle is held at the graduation on the far left end of the gauge scale. The gauge nee- dle remains at the left end of the gauge scale until the cluster receives a message from the PCM or ECM indicating that the engine temperature is above about 54° C (130° F) for gasoline engines, or about 60° C (140° F) for diesel engines, or until the ignition switch is turned to the Off position, whichever occurs first.† Engine Temperature High Message - Each time the cluster receives a message from the PCM or ECM indicating the engine coolant temperature is above about 122° C (252° F) for gasoline engines, or about 116° C (240° F) for diesel engines, the gauge needle is moved into the red zone at the far right end of gauge scale, the check gauges indicator is illumi- nated, and a single chime tone is sounded. The gauge needle remains in the red zone and the check gauges indicator the cluster receives a message from the PCM or ECM indicating that the engine temperature is below about 122° C (252° F) for gasoline engines, or about 116° C (240° F) for diesel engines, or until the ignition switch is turned to the Off position, whichever occurs first. The chime tone feature will only repeat during the same ignition cycle if the check gauges indicator is illuminated until remains cycled off and then on again by the appropriate engine temperature messages from the PCM or ECM. † Communication Error - If the cluster fails to receive an engine temperature message, it will hold the gauge needle at the last indication for about five seconds or until the ignition switch is turned to the Off position, whichever occurs first. After five sec- onds, the cluster will move the gauge needle to the low end of the gauge scale. † Actuator Test - Each time the cluster is put through the actuator test, the engine coolant temper- ature gauge needle will be swept to several calibra- tion points on the gauge scale in a prescribed sequence in order to confirm the functionality of the gauge and the cluster control circuitry. On vehicles with a gasoline engine, the PCM con- tinually monitors the engine coolant temperature sensor to determine the engine operating tempera- ture. On vehicles with a diesel engine, the ECM con- tinually monitors the engine coolant temperature sensor to determine the engine operating tempera- ture. The PCM or ECM then sends the proper engine coolant temperature messages to the instrument cluster. For further diagnosis of the engine coolant temperature gauge or the instrument cluster cir- cuitry that controls the gauge, (Refer to 8 - ELEC- TRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). If the instrument cluster turns on the check gauges indicator due to a high engine tem- perature gauge reading, it may indicate that the engine or the engine cooling system requires service. For proper diagnosis of the engine coolant tempera- ture sensor, the PCM, the ECM, the PCI data bus, or the electronic message inputs to the instrument clus- ter that control temperature gauge, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. the engine coolant ETC INDICATOR DESCRIPTION An Electronic Throttle Control (ETC) indicator is standard equipment on all gasoline engine instru- ment clusters. However, on vehicles not equipped with the optional 5.7 liter gasoline engine, this indi- cator is electronically disabled. The ETC indicator is located on the right side of the instrument cluster, to the right of the engine temperature gauge. The ETC indicator consists of a stencil-like cutout of the Inter- national Control and Display Symbol icon for “Elec- tronic Throttle Control” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. A red Light Emit- ting Diode (LED) behind the cutout in the opaque DR ETC INDICATOR (Continued) layer of the overlay causes the icon to appear in red through the translucent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The ETC indicator is ser- viced as a unit with the instrument cluster. OPERATION (ETC) The Electronic Throttle Control indicator gives an indication to the vehicle operator when the ETC system is faulty or inoperative. The ETC indi- cator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and electronic messages received by the cluster from the Powertrain Control Module (PCM) over the Pro- grammable Communications Interface (PCI) data bus. The ETC indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indi- cator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any posi- tion except On or Start. The LED only illuminates when it is provided a path to ground by the instru- ment cluster transistor. The instrument cluster will turn on the ETC indicator for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position the ETC indicator is illu- minated for about six seconds. The entire six second bulb test is a function of the PCM. † ETC Lamp-On Message - Each time the clus- ter receives a lamp-on message from the PCM, the ETC indicator will be illuminated. The indicator can be flashed on and off, or illuminated solid, as dic- tated by the PCM message. The indicator remains illuminated solid or continues to flash for about twelve seconds or until the cluster receives a lamp-off message from the PCM, whichever is longer. If the indicator is illuminated solid with the engine run- ning the vehicle will usually remain drivable. If the indicator is flashing with the engine running the vehicle may require towing. A flashing indicator means the ETC system requires immediate service. † Communication Error - If the cluster receives no ETC lamp messages for three consecutive seconds, the ETC indicator is illuminated. The indicator remains illuminated until the cluster receives a sin- gle lamp-off message from the PCM. † Actuator Test - Each time the cluster is put through the actuator test, the ETC indicator will be turned on, then off again during the bulb check por- tion of the test to confirm the functionality of the LED and the cluster control circuitry. The actuator test illumination of the ETC indicator is a function of the PCM. INSTRUMENT CLUSTER 8J - 25 The PCM continually monitors the ETC system cir- cuits and sensors to decide whether the system is in good operating condition. The PCM then sends the proper lamp-on or lamp-off messages to the instru- ment cluster. If the PCM sends a lamp-on message after the bulb test, it indicates that the PCM has detected a system malfunction and/or that the ETC system is inoperative. The PCM will store a Diagnos- tic Trouble Code (DTC) for any malfunction it detects. Each time the ETC indicator fails to illumi- nate due to an open or short in the cluster ETC indi- cator circuit, the cluster sends a message notifying the PCM of the condition, the instrument cluster and the PCM will each store a DTC. For proper diagnosis of the ETC system, the PCM, the PCI data bus, or the electronic message inputs to the instrument clus- ter that control the ETC indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. FUEL GAUGE DESCRIPTION A fuel gauge is standard equipment on all instru- ment clusters. The fuel gauge is located in the lower left quadrant of the instrument cluster, below the voltage gauge. The fuel gauge consists of a movable gauge needle or pointer controlled by the instrument cluster circuitry and a fixed 90 degree scale on the cluster overlay that reads left-to-right from “E” (or Empty) to “F” (or Full). An International Control and Display Symbol icon for “Fuel” is located on the clus- ter overlay, directly below the right end of the gauge scale. An arrowhead pointed to the left side of the vehicle is imprinted on the cluster overlay next to the “Fuel” icon in the fuel gauge to provide the driver with a reminder as to the location of the fuel filler access. On vehicles equipped with a diesel engine, text that specifies “DIESEL ONLY” is located across the fuel gauge below the gauge scale, but above the hub of the gauge needle. The fuel gauge graphics are black against a white field except for a single red graduation at the low end of the gauge scale, making them clearly visible within the instrument cluster in daylight. When illuminated from behind by the panel lamps dimmer controlled cluster illumination lighting with the exterior lamps turned On, the black graph- ics appear blue and the red graphics still appear red. The orange gauge needle is internally illuminated. Gauge illumination is provided by replaceable incan- descent bulb and bulb holder units located on the instrument cluster electronic circuit board. The fuel gauge is serviced as a unit with the instrument clus- ter. INSTRUMENT CLUSTER 8J - 26 FUEL GAUGE (Continued) OPERATION (PCM) The fuel gauge gives an indication to the vehicle operator of the level of fuel in the fuel tank. This gauge is controlled by the instrument cluster circuit board based upon cluster programming and elec- tronic messages received by the cluster from the Powertrain Control Module on vehicles equipped with a gasoline engine, or from the Engine Control Module (ECM) on vehicles equipped with a diesel engine over the Programmable Communica- tions Interface (PCI) data bus. The fuel gauge is an air core magnetic unit that receives battery current on the instrument cluster electronic circuit board through the fused ignition switch output (run-start) circuit whenever the ignition switch is in the On or Start positions. The cluster is programmed to move the gauge needle back to the low end of the scale after the ignition switch is turned to the Off position. The instrument cluster circuitry controls the gauge needle position and provides the following features: † Percent Tank Full Message - Each time the cluster receives a message from the PCM or ECM indicating the percent tank full, the cluster program- ming applies an algorithm to calculate the proper gauge needle position, then moves the gauge needle to the proper relative position on the gauge scale. The algorithm is used to dampen gauge needle move- ment against the negative effect that fuel sloshing within the fuel tank can have on accurate inputs from the fuel tank sending unit to the PCM or ECM. † Less Than Twenty Percent Tank Full Mes- sage - Each time the cluster receives messages from the PCM or ECM indicating the percent tank full is about twenty percent or less for ten consecutive sec- onds and the vehicle speed is zero, or for sixty con- secutive seconds and the vehicle speed is greater than zero, the gauge needle is moved to the one- eighth graduation or below on the gauge scale, the low fuel indicator is illuminated, and a single chime tone is sounded. The low fuel indicator remains illu- minated until the cluster receives messages from the PCM or ECM indicating that the percent tank full is greater than about twenty percent for ten consecu- tive seconds and the vehicle speed is zero, or for sixty consecutive seconds and the vehicle speed is greater than zero, or until the ignition switch is turned to the Off position, whichever occurs first. The chime tone feature will only repeat during the same igni- tion cycle if the low fuel indicator is cycled off and then on again by the appropriate percent tank full messages from the PCM or ECM. † Less Than Empty Percent Tank Full Mes- sage - Each time the cluster receives a message from the PCM or ECM indicating the percent tank full is less than empty, the gauge needle is moved to the far left end of the gauge scale and the low fuel indicator DR is illuminated immediately. This message would indi- cate that the fuel tank sender input to the PCM or ECM is a short circuit. † More Than Full Percent Tank Full Message - Each time the cluster receives a message from the PCM or ECM indicating the percent tank full is more than full, the gauge needle is moved to the far left end of the gauge scale and the low fuel indicator is illuminated immediately. This message would indi- cate that the fuel tank sender input to the PCM or ECM is an open circuit. † Communication Error - If the cluster fails to receive a percent tank full message, it will hold the gauge needle at the last indication about five seconds or until the ignition switch is turned to the Off posi- tion, whichever occurs first. After five seconds, the cluster will move the gauge needle to the low end of the gauge scale. † Actuator Test - Each time the cluster is put through the actuator test, the fuel gauge needle will be swept to several calibration points on the gauge scale in a prescribed sequence in order to confirm the functionality of the gauge and the cluster control cir- cuitry. On vehicles with a gasoline engine, the PCM con- tinually monitors the fuel tank sending unit to deter- mine the level of the fuel in the fuel tank. On vehicles with a diesel engine, the ECM continually monitors the fuel tank sending unit to determine the level of the fuel in the fuel tank. The PCM or ECM then sends the proper fuel level messages to the instrument cluster. For further diagnosis of the fuel gauge or the instrument cluster circuitry that con- trols the gauge, (Refer to 8 - ELECTRICAL/INSTRU- MENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the fuel tank sending unit, the PCM, the ECM, the PCI data bus, or the elec- tronic message inputs to the instrument cluster that control is required. Refer to the appropriate diagnostic infor- mation. the fuel gauge, a DRBIIIt scan tool GEAR SELECTOR INDICATOR DESCRIPTION An electronic automatic transmission gear selector indicator is standard factory-installed equipment on this model. The gear selector indicator information is displayed in a Vacuum-Fluorescent Display (VFD) unit. The VFD is soldered onto the cluster electronic circuit board and is visible through a window with a smoked clear lens located on the lower edge of the speedometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents the indicator from being clearly visible when it is not illuminated. DR GEAR SELECTOR INDICATOR (Continued) The gear selector indicator displays the following characters from left to right: “P,” “R,” “N,” “D,” “2,” and “1.” Respectively, these characters represent the park, reverse, neutral, drive, second gear, and first gear positions of the transmission gear selector lever on the steering column. The VFD illuminates a rect- angular box around the character that represents the currently selected lever position. The gear selector indicator characters and graphics appear in the same blue-green color and at the same lighting level as the odometer/trip odometer informa- tion when illuminated by the instrument cluster elec- tronic circuit board. During daylight hours (exterior lamps Off) the gear selector indicator VFD is illumi- nated at full brightness for clear visibility. At night (exterior lamps are On) the VFD lighting level is adjusted with the other cluster illumination lamps using the panel lamps dimmer thumbwheel on the headlamp switch. However, a “Parade” mode position of the panel lamps dimmer thumbwheel allows the VFD to be illuminated at full brightness when the vehicle is driven in daylight hours with the exterior lamps turned On. The gear selector indicator VFD is serviced as a unit with the instrument cluster. OPERATION The electronic gear selector indicator gives an indi- cation to the vehicle operator of the transmission gear that has been selected with the automatic trans- mission gear selector lever. This indicator is con- trolled by the instrument cluster circuit board based upon cluster programming. The cluster circuitry automatically configures itself for the proper trans- mission and automatic transmission model based upon the hard wired transmission range sensor mux circuit input to the cluster. The gear selector indica- tor information is displayed by a dedicated Vacuum Fluorescent Display (VFD) unit on the instrument cluster electronic circuit board, and the VFD will not display the gear selector indicator information after the ignition switch is turned to the Off position. The instrument cluster circuitry configures the gear selec- tor indicator VFD based upon the following inputs from the transmission range sensor: † Open Circuit - If the cluster is configured for an automatic transmission and the transmission range sensor mux circuit is open, the cluster circuitry controls the gear selector indicator display based upon electronic messages received from the electronic Transmission Control Module (TCM) over the Pro- grammable Communications Interface (PCI) data bus. If the transmission range sensor mux circuit is open and no electronic messages are received from the TCM within two seconds, the instrument cluster circuitry will not display any gear selector position until the condition is resolved or until the ignition INSTRUMENT CLUSTER 8J - 27 switch is turned to the Off position, whichever occurs first.† Resolved Circuit - If the transmission range sensor mux circuit is resolved, the cluster circuitry controls the gear selector indicator display based upon the resistance value of the hard wired input from the transmission range sensor. If the cluster is configured for an automatic transmission with a transmission range sensor input and detects a short to ground or an open in the transmission range sen- sor mux input, the instrument cluster circuitry will not display any gear selector position in the VFD. The VFD display for the short-to-ground and open circuit conditions will continue until the condition is resolved or until the ignition switch is turned to the Off position, whichever occurs first. † Actuator Test - Each time the cluster is put through the actuator test, the gear selector indicator VFD will display all of its characters at once during the VFD portion of the test to confirm the function- ality of the VFD and the cluster control circuitry. On models with a TCM, the TCM continually mon- itors the transmission range sensor, then sends the proper gear selector indicator position messages to the instrument cluster. On models without a TCM, the instrument cluster continually monitors the hard wired transmission range sensor multiplexed input. For further diagnosis of the gear selector indicator or the instrument cluster circuitry that controls this function, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). For fur- ther diagnosis of the transmission range sensor on models without a TCM, (Refer to 21 - TRANSMIS- SION/TRANSAXLE/AUTOMATIC - 42RE/TRANS- MISSION RANGE SENSOR - DIAGNOSIS AND TESTING) or to 21 - TRANSMISSION/ TRANSAXLE/AUTOMATIC - 46RE/TRANSMISSION RANGE SENSOR - DIAGNOSIS AND TESTING). On models with a TCM, for proper diagnosis of the transmission range sensor, the TCM, the PCI data bus, or the electronic message inputs to the instru- ment cluster that control the gear selector indicator, a DRBIIIt scan tool is required. Refer to the appro- priate diagnostic information. (Refer HIGH BEAM INDICATOR DESCRIPTION A high beam indicator is standard equipment on all instrument clusters. The high beam indicator is located near the upper edge of the instrument clus- ter, between the tachometer and the speedometer. The high beam indicator consists of a stencil-like cut- out of the International Control and Display Symbol icon for “High Beam” in the opaque layer of the INSTRUMENT CLUSTER 8J - 28 HIGH BEAM INDICATOR (Continued) instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when the it is not illuminated. A blue Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the icon to appear in blue through the translucent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The high beam indicator is serviced as a unit with the instru- ment cluster. OPERATION The high beam indicator gives an indication to the vehicle operator whenever the headlamp high beams are illuminated. This indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and a hard wired multiplex input received by the cluster from the headlamp beam select switch circuitry of the multi- function switch on the washer/beam select switch mux circuit. The high beam indicator Light Emitting Diode (LED) is completely controlled by the instru- ment cluster logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the high beam indicator for the following reasons: † High Beam Headlamps-On Input - Each time the cluster detects a high beam headlamps-on input from the headlamp beam select switch circuitry of the multi-function switch on the washer/beam select switch mux circuit, the headlamp high beams and the high beam indicator will be illuminated. The headlamp high beams and the high beam indicator remain illuminated until the cluster receives a high beam headlamps-off input from the multi-function switch, or until the exterior lamp load shedding (bat- tery saver) timed interval expires, whichever occurs first.† Actuator Test - Each time the cluster is put through the actuator test, the high beam indicator will be turned on, then off again during the bulb check portion of the test to confirm the functionality of the LED and the cluster control circuitry. The instrument cluster continually monitors the headlamp switch and the multi-function switch to determine the proper headlamp low beam and high beam control. The instrument cluster then sends the proper low beam and high beam lamp-on and lamp- off messages to the Front Control Module (FCM) over the Programmable Communications Interface (PCI) DR data bus and turns the high beam indicator on or off accordingly. For further diagnosis of the high beam indicator or the instrument cluster circuitry that con- trols the indicator, (Refer to 8 - ELECTRICAL/IN- STRUMENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the headlamps, or the headlamp switch and multi-function switch inputs to the instrument cluster that control the high beam indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. LAMP OUT INDICATOR DESCRIPTION A lamp out indicator is standard equipment on all instrument clusters. The lamp out indicator consists of the words “LAMP OUT”, which appear in the lower portion of the odometer/trip odometer Vacuum- Fluorescent Display (VFD) unit. The VFD is soldered onto the cluster electronic circuit board and is visible through a window with a smoked clear lens located on the lower edge of the tachometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents the indicator from being clearly visible when it is not illuminated. The words “LAMP OUT” appear in an amber color and at the same lighting level as the odometer/trip odometer information when they are illuminated by the instrument cluster electronic circuit board. The lamp out indicator is serviced as a unit with the VFD in the instrument cluster. OPERATION The lamp out indicator gives an indication to the vehicle operator when an exterior lamp has failed. This indicator is controlled by the instrument cluster circuit board based upon cluster programming and electronic messages received by the cluster from the Front Control Module (FCM) over the Programmable Communications Interface (PCI) data bus. The lamp out indicator is completely controlled by the instru- ment cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the indicator will always be off when the ignition switch is in any position except On or Start. The indicator only illuminates when it is switched to ground by the instrument cluster circuitry. The instrument cluster will turn on the lamp out indica- tor for the following reasons: † Lamp Out Indicator Lamp-On Message - Each time the cluster receives a lamp out indicator lamp-on message from the FCM indicating that an inoperative headlamp (low or high beam), turn signal DR LAMP OUT INDICATOR (Continued) INSTRUMENT CLUSTER 8J - 29 remains or brake illuminated until lamp (excluding Center High lamp, Mounted Stop Lamp [CHMSL]) circuit has been detected, the lamp out indicator is illuminated. The indicator the cluster receives a lamp out indicator lamp-off message from the FCM or until the ignition switch is turned to the Off position, whichever occurs first. † Actuator Test - Each time the cluster is put through the actuator test, the lamp out indicator will be turned on, then off again during the VFD portion of the test to confirm the functionality of the VFD and the cluster control circuitry. The FCM monitors each of the headlamp, turn sig- nal lamp, and brake lamp (except CHMSL) circuits to determine the condition of these exterior lamps. The FCM then sends the proper lamp out indicator lamp-on and lamp-off messages to the instrument cluster. For further diagnosis of the lamp out indica- tor or the instrument cluster circuitry that controls the indicator, (Refer to 8 - ELECTRICAL/INSTRU- MENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the exterior lighting system circuits, the FCM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the lamp out is required. Refer to the appropriate diagnostic infor- mation. indicator, a DRBIIIt scan tool LOW FUEL INDICATOR DESCRIPTION A low fuel indicator is standard equipment on all instrument clusters. The low fuel indicator is located on the left side of the instrument cluster, to the left of the fuel gauge. The low fuel indicator consists of a stencil-like cutout of the International Control and Display Symbol icon for “Fuel” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. An amber Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the icon to appear in amber through the translucent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The low fuel indicator is serviced as a unit with the instru- ment cluster. OPERATION The low fuel indicator gives an indication to the vehicle operator when the level of fuel in the fuel tank becomes low. This indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and electronic mes- sages received by the cluster from the Powertrain Control Module (PCM) on vehicles equipped with a gasoline engine, or from the Engine Control Module (ECM) on vehicles equipped with a diesel engine over the Programmable Communications Interface (PCI) data bus. The low fuel indicator Light Emitting Diode (LED) is completely controlled by the instru- ment cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the low fuel indicator for the fol- lowing reasons: † Bulb Test - Each time the ignition switch is turned to the On position the low fuel indicator is illuminated for about two seconds as a bulb test. † Less Than Twenty Percent Tank Full Mes- sage - Each time the cluster receives messages from the PCM or ECM indicating the percent tank full is about twenty percent or less for ten consecutive sec- onds and the vehicle speed is zero, or for sixty con- secutive seconds and the vehicle speed is greater than zero, the fuel gauge needle is moved to the one- eighth graduation or below on the gauge scale, the low fuel indicator is illuminated and a single chime tone is sounded. The low fuel indicator remains illu- minated until the cluster receives messages from the PCM or ECM indicating that the percent tank full is greater than about twenty percent for ten consecu- tive seconds and the vehicle speed is zero, or for sixty consecutive seconds and the vehicle speed is greater than zero, or until the ignition switch is turned to the Off position, whichever occurs first. The chime tone feature will only repeat during the same igni- tion cycle if the low fuel indicator is cycled off and then on again by the appropriate percent tank full messages from the PCM or ECM. † Less Than Empty Percent Tank Full Mes- sage - Each time the cluster receives a message from the PCM or ECM indicating the percent tank full is less than empty, the low fuel indicator is illuminated immediately. This message would indicate that the fuel tank sender input to the PCM or ECM is a short circuit. † More Than Full Percent Tank Full Message - Each time the cluster receives a message from the PCM or ECM indicating the percent tank full is more than full, the low fuel indicator is illuminated imme- diately. This message would indicate that the fuel tank sender input to the PCM or ECM is an open cir- cuit. INSTRUMENT CLUSTER 8J - 30 LOW FUEL INDICATOR (Continued) † Actuator Test - Each time the cluster is put through the actuator test, the low fuel indicator will be turned on, then off again during the bulb check portion of the test to confirm the functionality of the LED and the cluster control circuitry. On vehicles with a gasoline engine, the PCM con- tinually monitors the fuel tank sending unit to deter- mine the level of fuel in the fuel tank. On vehicles with a diesel engine, the ECM continually monitors the fuel tank sending unit to determine the level of fuel in the fuel tank. The PCM or ECM then sends the proper fuel level messages to the instrument cluster. For further diagnosis of the low fuel indicator or the instrument cluster circuitry that controls the LED, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the fuel tank sending unit, the PCM, the ECM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the low fuel is required. Refer to the appropriate diagnostic infor- mation. indicator, a DRBIIIt scan tool MALFUNCTION INDICATOR LAMP (MIL) DESCRIPTION A Malfunction Indicator Lamp (MIL) is standard equipment on all instrument clusters. The MIL is located on the left side of the instrument cluster, to the left of the voltage gauge. The MIL consists of a stencil-like cutout of the International Control and Display Symbol icon for “Engine” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. An amber Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the icon to appear in amber through the translucent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The MIL is serviced as a unit with the instrument cluster. OPERATION The Malfunction Indicator Lamp (MIL) gives an indication to the vehicle operator when the Power- train Control Module (PCM) on vehicles with a gaso- line engine, or the Engine Control Module (ECM) on vehicles with a diesel engine has recorded a Diagnos- tic Trouble Code (DTC) for an On-Board Diagnostics II (OBDII) emissions-related circuit or component malfunction. The MIL is controlled by a transistor on the instrument cluster circuit board based upon clus- ter programming and electronic messages received by DR the cluster from the PCM or ECM over the Program- mable Communications Interface (PCI) data bus. The MIL Light Emitting Diode (LED) is completely con- trolled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery cur- rent input on the fused ignition switch output (run- start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is pro- vided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the MIL for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position the indicator is illuminated for about two seconds as a bulb test. The entire two second bulb test is a function of the PCM or ECM. † MIL Lamp-On Message - Each time the clus- ter receives a MIL lamp-on message from the PCM or ECM, the indicator will be illuminated. The indi- cator can be flashed on and off, or illuminated solid, as dictated by the PCM or ECM message. For some DTC’s, if a problem does not recur, the PCM or ECM will send a lamp-off message automatically. Other DTC’s may require that a fault be repaired and the PCM or ECM be reset before a lamp-off message will be sent. For more information on the PCM, the ECM, and the DTC set and reset parameters, (Refer to 25 - EMISSIONS CONTROL - OPERATION). † Communication Error - If the cluster receives no lamp-on message from the PCM or ECM for ten seconds, the MIL is illuminated by the instrument cluster to indicate a loss of bus communication. The indicator remains controlled and illuminated by the cluster until a valid lamp-on message is received from the PCM or ECM. † Actuator Test - Each time the cluster is put through the actuator test, the MIL indicator will be turned on during the bulb check portion of the test to confirm the functionality of the LED and the cluster control circuitry. On vehicles with a gasoline engine, the PCM con- tinually monitors the fuel and emissions system cir- cuits and sensors to decide whether the system is in good operating condition. On vehicles with a diesel engine, the ECM continually monitors the fuel and emissions system circuits and sensors to decide whether the system is in good operating condition. The PCM or ECM then sends the proper lamp-on or lamp-off messages to the instrument cluster. For fur- ther diagnosis of the MIL or the instrument cluster circuitry that controls the LED, (Refer to 8 - ELEC- TRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). If the instrument cluster turns on the MIL after the bulb test, it may indicate that a malfunction has occurred and that the fuel and emis- DR MALFUNCTION INDICATOR LAMP (MIL) (Continued) INSTRUMENT CLUSTER 8J - 31 sions systems may require service. For proper diag- nosis of the fuel and emissions systems, the PCM, the ECM, the PCI data bus, or the electronic mes- sage inputs to the instrument cluster that control the MIL, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. ODOMETER DESCRIPTION An odometer and trip odometer are standard equipment in all instrument clusters. The odometer, trip odometer, and engine hours information are dis- played in a common electronic, blue-green Vacuum- Fluorescent Display (VFD). The VFD is soldered onto the cluster electronic circuit board and is visible through a window with a smoked clear lens located on the lower edge of the tachometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents it from being clearly visible when it is not illuminated. However, the odometer, trip odometer, and engine hours information are not displayed simultaneously. The trip odometer reset switch on the instrument cluster circuit board toggles the dis- play between odometer and trip odometer modes by depressing the odometer/trip odometer switch button that extends through the lower edge of the cluster lens, just left of the odometer VFD. When the trip odometer information is displayed, the word “TRIP” is also illuminated in the upper right corner of the VFD in a blue-green color and at the same lighting level as the trip odometer information. The engine hours information replaces the selected odometer or trip odometer information whenever the ignition switch is in the On position and the engine is not running. The odometer, trip odometer, and engine hours information is stored in the instrument cluster mem- ory. This information can be increased when the proper inputs are provided to the instrument cluster, but the information cannot be decreased. The odom- eter can display values up to 999,999 kilometers (999,999 miles). The odometer latches at these val- ues, and will not roll over to zero. The trip odometer can display values up to 9,999.9 kilometers (9,999.9 miles) before it rolls over to zero. The odometer dis- play does not have a decimal point and will not show values less than a full unit (kilometer or mile), while the trip odometer display does have a decimal point and will show tenths of a unit (kilometer or mile). The unit of measure (kilometers or miles) for the odometer and trip odometer display is not shown in the VFD. The unit of measure for the instrument cluster odometer/trip odometer is selected at the time that it is manufactured, and cannot be changed. Engine hours are displayed in the format, “hr9999”. The cluster will accumulate values up to 9,999 hours before the display rolls over to zero. The odometer has a “Rental Car” mode, which will illuminate the odometer information in the VFD whenever the driver side front door is opened with the ignition switch in the Off or Accessory positions. During daylight hours (exterior lamps are Off) the VFD is illuminated at full brightness for clear visibil- ity. At night (exterior lamps are On) the VFD lighting level is adjusted with the other cluster illumination lamps using the panel lamps dimmer thumbwheel on the headlamp switch. However, a “Parade” mode position of the panel lamps dimmer thumbwheel allows the VFD to be illuminated at full brightness if the exterior lamps are turned On during daylight hours. The VFD, the trip odometer switch, and the trip odometer switch button are serviced as a unit with the instrument cluster. OPERATION The odometer and trip odometer give an indication to the vehicle operator of the distance the vehicle has traveled. The engine hours give an indication of the cumulative engine-on time. This indicator is con- trolled by the instrument cluster circuitry based upon cluster programming and electronic messages received by the cluster from the Powertrain Control Module (PCM) over the Programmable Communica- tions Interface (PCI) data bus. The odometer, trip odometer and engine hours information is displayed by the instrument cluster Vacuum Fluorescent Dis- play (VFD). The VFD will display the odometer infor- mation whenever any door is opened with the ignition switch in the Off or Accessory positions, and will display the last previously selected odometer or trip odometer information when the ignition switch is turned to the On or Start positions. The instrument cluster circuitry controls the VFD and provides the following features: † Odometer/Trip Odometer Display Toggling - Actuating the trip odometer reset switch button momentarily with the VFD illuminated will toggle the display between the odometer and trip odometer information. Each time the VFD is illuminated with the ignition switch in the On or Start positions, the display will automatically return to the last mode previously selected (odometer or trip odometer). † Engine Hours Display Toggling - When the trip odometer reset switch button is pressed and held for longer than about six seconds with the ignition switch in the On position and the engine speed mes- sage from the PCM is zero, the trip odometer infor- mation will be momentarily displayed, then the engine hours information will be displayed. The VFD INSTRUMENT CLUSTER 8J - 32 ODOMETER (Continued) must be displaying the odometer information when the trip odometer reset switch button is pressed in order to toggle to the engine hours display. The engine hours will remain displayed for about thirty seconds, until the engine speed message is greater than zero, or until the ignition switch is turned to the Off position, whichever occurs first. † Trip Odometer Reset - When the trip odome- ter reset switch button is pressed and held for longer than about two seconds with the ignition switch in the On or Start positions, the trip odometer will be reset to 0.0 kilometers (miles). The VFD must be dis- playing the trip odometer information in order for the trip odometer information to be reset. † Communication Error - If the cluster fails to receive a distance message during normal operation, it will hold and display the last data received until the ignition switch is turned to the Off position. If the cluster does not receive a distance message within one second after the ignition switch is turned to the On position, it will display the last distance message stored in the cluster memory. If the cluster is unable to display distance information due to an error internal to the cluster, the VFD display will be dashes. † Actuator Test - Each time the cluster is put through the actuator test, the odometer VFD will dis- play all of its segments simultaneously during the VFD portion of the test to confirm the functionality of each of the VFD segments and the cluster control circuitry. The PCM continually monitors the vehicle speed pulse information received from the vehicle speed sensor and engine speed pulse information received from the crankshaft position sensor, then sends the proper distance and engine speed messages to the instrument cluster. For further diagnosis of the odometer/trip odometer or the instrument cluster cir- cuitry that controls these functions, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNO- SIS AND TESTING). For proper diagnosis of the vehicle speed sensor, the crankshaft position sensor, the PCM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the odometer/trip odometer, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic infor- mation. OIL PRESSURE GAUGE DESCRIPTION An oil pressure gauge is standard equipment on all instrument clusters. The oil pressure gauge is located in the upper right quadrant of the instrument clus- ter, above the coolant temperature gauge. The oil DR pressure gauge consists of a movable gauge needle or pointer controlled by the instrument cluster circuitry and a fixed 90 degree scale on the cluster overlay that reads left-to-right from “L” (or Low) to “H” (or High) for gasoline engines. On vehicles with a diesel engine the scale reads from “0” kPa to “760” kPa in markets where a metric instrument cluster is speci- fied, or from “0” psi to “110” psi in all other markets. An International Control and Display Symbol icon for “Engine Oil” is located on the cluster overlay, directly below the left end of the gauge scale. The oil pres- sure gauge graphics are black against a white field except for two red graduations at the low end of the gauge scale, making them clearly visible within the instrument cluster in daylight. When illuminated from behind by the panel lamps dimmer controlled cluster illumination lighting with the exterior lamps turned On, the black graphics appear blue and the red graphics still appear red. The orange gauge nee- dle is internally illuminated. Gauge illumination is provided by replaceable incandescent bulb and bulb holder units located on the instrument cluster elec- tronic circuit board. The oil pressure gauge is ser- viced as a unit with the instrument cluster. OPERATION The oil pressure gauge gives an indication to the vehicle operator of the engine oil pressure. This gauge is controlled by the instrument cluster circuit board based upon cluster programming and elec- tronic messages received by the cluster from the Powertrain Control Module (PCM) on vehicles with a gasoline engine, or from the Engine Control Module (ECM) on vehicles equipped with a diesel engine over the Programmable Communications Interface (PCI) data bus. The oil pressure gauge is an air core mag- netic unit that receives battery current on the instru- ment cluster electronic circuit board through the fused ignition switch output (run-start) circuit when- ever the ignition switch is in the On or Start posi- tions. The cluster is programmed to move the gauge needle back to the low end of the scale after the igni- tion switch is turned to the Off position. The instru- ment cluster circuitry controls the gauge needle position and provides the following features: † Engine Oil Pressure Message - The instru- ment cluster circuitry restricts the oil pressure gauge needle operation in order to provide readings that are consistent with customer expectations. Each time the cluster receives a message from the PCM or ECM indicating the engine oil pressure is above about 41 kPa (6 psi) the cluster holds the gauge needle at a point near the middle increment within the normal range on the gauge scale. † Engine Oil Pressure Low Message - Each time the cluster receives a message from the PCM or DR OIL PRESSURE GAUGE (Continued) ECM indicating the engine oil pressure is below about 41 kPa (6 psi), the gauge needle is moved to the graduation at the far left end of the gauge scale, the check gauges indicator is illuminated, and a sin- gle chime tone is generated. The gauge needle remains at the left end of the gauge scale and the check gauges indicator remains illuminated until the cluster receives a message from the PCM or ECM indicating that the engine oil pressure is above about 41 kPa (6 psi), or until the ignition switch is turned to the Off position, whichever occurs first. The clus- ter will only turn the check gauges indicator on in response to an engine oil pressure low message if the engine speed message is greater than zero. † Communication Error - If the cluster fails to receive an engine oil pressure message, it will hold the gauge needle at the last indication about five sec- onds or until the ignition switch is turned to the Off position, whichever occurs first. After five seconds, the cluster will move the gauge needle to the left end of the gauge scale. † Actuator Test - Each time the cluster is put through the actuator test, the oil pressure gauge nee- dle will be swept to several calibration points on the gauge scale in a prescribed sequence in order to con- firm the functionality of the gauge and the cluster control circuitry. On vehicles with a gasoline engine, the PCM con- tinually monitors the engine oil pressure sensor to determine the engine oil pressure. On vehicles with a diesel engine, the ECM continually monitors the engine oil pressure sensor to determine the engine oil pressure. The PCM or ECM then sends the proper engine oil pressure messages to the instrument clus- ter. For further diagnosis of the oil pressure gauge or the instrument cluster circuitry that controls the gauge, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). If the instrument cluster turns on the check gauges indica- tor due to a low oil pressure gauge reading, it may indicate that the engine or the engine oiling system requires service. For proper diagnosis of the engine oil pressure sensor, the PCM, the ECM, the PCI data bus, or the electronic message inputs to the instru- ment cluster that control the oil pressure gauge, a DRBIIIt scan tool is required. Refer to the appropri- ate diagnostic information. OVERDRIVE OFF INDICATOR DESCRIPTION An overdrive off indicator is standard equipment on all instrument clusters. However, on vehicles not equipped with the optional overdrive automatic transmission, this indicator is electronically disabled. INSTRUMENT CLUSTER 8J - 33 The overdrive off indicator consists of the words “O/D OFF”, which appear in the lower portion of the odom- eter/trip odometer indicator Vacuum Fluorescent Dis- play (VFD) unit. The VFD is soldered onto the cluster electronic circuit board and is visible through a window with a smoked clear lens located on the lower edge of the tachometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents the indicator from being clearly visible when it is not illuminated. The words “O/D OFF” appear in an amber color and at the same lighting level as the odometer/trip odometer information when they are illuminated by the instrument cluster electronic cir- cuit board. The overdrive off indicator is serviced as a unit with the VFD in the instrument cluster. OPERATION over The overdrive off indicator gives an indication to the vehicle operator when the Off position of the overdrive off switch has been selected, disabling the electronically controlled overdrive feature of the auto- matic transmission. This indicator is controlled by the instrument cluster circuit board based upon clus- ter programming and electronic messages received by the cluster from the Powertrain Control Module (PCM) the Programmable Communications Interface (PCI) data bus. The overdrive off indicator is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indi- cator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the indicator will always be off when the ignition switch is in any position except On or Start. The indicator only illu- minates when it is switched to ground by the instru- ment cluster circuitry. The instrument cluster will turn on the overdrive off indicator for the following reasons: † Overdrive Off Lamp-On Message - Each time the cluster receives an overdrive off lamp-on message from the PCM indicating that the Off position of the overdrive off switch has been selected, the overdrive off indicator will be illuminated. The indicator remains illuminated until the cluster receives an overdrive off lamp-off message from the PCM, or until the ignition switch is turned to the Off position, whichever occurs first. † Actuator Test - Each time the cluster is put through the actuator test, the overdrive off indicator will be turned on, then off again during the VFD por- tion of the test to confirm the functionality of the VFD and the cluster control circuitry. The PCM continually monitors the overdrive off switch to determine the proper outputs to the auto- matic transmission. The PCM then sends the proper overdrive off lamp-on and lamp-off messages to the INSTRUMENT CLUSTER 8J - 34 OVERDRIVE OFF INDICATOR (Continued) instrument cluster. For further diagnosis of the over- drive off indicator or the instrument cluster circuitry that controls the indicator, (Refer to 8 - ELECTRI- CAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the overdrive con- trol system, the PCM, the PCI data bus, or the elec- tronic message inputs to the instrument cluster that control the overdrive off indicator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. SEATBELT INDICATOR DESCRIPTION A seatbelt indicator is standard equipment on all instrument clusters. The seatbelt indicator is located on the upper edge of the instrument cluster, between the tachometer and the speedometer. The seatbelt indicator consists of a stencil-like cutout of the Inter- national Control and Display Symbol icon for “Seat Belt” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is not illuminated. A red Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the icon to appear in red through the translu- cent outer layer of the overlay when the indicator is illuminated from behind by the LED, which is sol- dered onto the instrument cluster electronic circuit board. The seatbelt indicator is serviced as a unit with the instrument cluster. OPERATION The seatbelt indicator gives an indication to the vehicle operator of the status of the driver side front seatbelt. This indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and a hard wired input from the seatbelt switch in the driver side front seatbelt buckle through the seat belt indicator driver circuit. The seatbelt indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a bat- tery current input on the fused ignition switch out- put the LED will always be off when the ignition switch is in any posi- tion except On or Start. The LED only illuminates when it is provided a path to ground by the instru- ment cluster transistor. The instrument cluster will turn on the seatbelt indicator for the following rea- sons:† Seatbelt Reminder Function - Each time the cluster receives a battery current input on the fused ignition switch output (run-start) circuit, the indica- (run-start) circuit. Therefore, DR tor will be illuminated as a seatbelt reminder for about six seconds, or until the ignition switch is turned to the Off position, whichever occurs first. This reminder function will occur regardless of the status of the seatbelt switch input to the cluster. † Driver Side Front Seatbelt Not Buckled - Following the seatbelt reminder function, each time the cluster detects an open circuit on the seat belt indicator driver circuit (seatbelt switch open = seat- belt unbuckled) with the ignition switch in the Start or On positions, the indicator will be illuminated. The seatbelt indicator remains illuminated until the seat belt indicator driver input to the cluster is closed to ground (seatbelt switch closed = seatbelt buckled), or until the ignition switch is turned to the Off position, whichever occurs first. † Airbag Indicator Backup - If the instrument cluster detects a fault in the airbag indicator circuit it will send a message indicating the fault to the Air- bag Control Module (ACM), store a Diagnostic Trou- ble Code (DTC) in the cluster memory, then flash the seatbelt indicator on and off. The cluster will con- tinue to flash the seatbelt indicator until the airbag indicator circuit fault is resolved, or until the ignition switch is turned to the Off position, whichever occurs first.† Actuator Test - Each time the cluster is put through the actuator test, the seatbelt indicator will be turned on, then off again during the bulb check portion of the test to confirm the functionality of the LED and the cluster control circuitry. The seatbelt switch is connected in series between ground and the seat belt indicator driver input to the instrument cluster. The seatbelt switch input to the instrument cluster circuitry may be diagnosed using conventional diagnostic tools and methods. For fur- ther diagnosis of the seatbelt indicator or the instru- ment cluster circuitry that controls the LED, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). SECURITY INDICATOR DESCRIPTION clusters. However, A security indicator is standard equipment on all on vehicles not instrument equipped with the optional Vehicle Theft Security System (VTSS), this indicator is electronically dis- abled. The security indicator is located in the lower right quadrant of the instrument cluster, between the speedometer and the coolant temperature gauge. The security indicator consists of a small round cutout in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indi- cator from being clearly visible when it is not illumi- DR SECURITY INDICATOR (Continued) nated. A red Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes the indicator to appear in red through the translucent outer layer of the overlay when it is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The secu- rity indicator is serviced as a unit with the instru- ment cluster. OPERATION The security indicator gives an indication to the vehicle operator when the Vehicle Theft Security Sys- tem (VTSS) is arming or is armed. On models equipped with the Sentry Key Immobilizer System (SKIS), the security indicator also gives an indication to the vehicle operator of the status of the SKIS. This indicator is controlled by a transistor on the instru- ment cluster circuit board based upon cluster pro- gramming, hard wired inputs to the cluster from the various security system components, electronic mes- sages received by the cluster from the Remote Key- less Entry (RKE) receiver module over a dedicated serial bus, and electronic messages received by the cluster from the Sentry Key Immobilizer Module (SKIM) over the Programmable Communications Interface (PCI) data bus. The security indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit, and that logic will allow this indicator to operate whenever the instru- ment cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illumi- nated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the security indicator for the following reasons: † Bulb Test - Each time the ignition switch is turned to the On position, the SKIM tells the cluster to illuminate the SKIS indicator for about two sec- onds as a bulb test. † VTSS Indication - During the sixteen second VTSS arming function, the cluster will flash the security indicator on and off repeatedly at a steady, fast rate to indicate that the VTSS is in the process of arming. Following successful VTSS arming, the cluster flashes the security indicator on and off con- tinuously at a slower rate to indicate that the VTSS is armed. The security indicator continues flashing at the slower rate until the VTSS is disarmed or trig- gered. If the VTSS has alarmed and rearmed, the cluster will flash the security indicator at a steady, slow rate for about thirty seconds after the VTSS is disarmed. † SKIM Lamp-On Message - Each time the clus- ter receives a lamp-on message from the SKIM, the security indicator will be illuminated. The indicator INSTRUMENT CLUSTER 8J - 35 can be flashed on and off, or illuminated solid, as dic- tated by the SKIM message. The indicator remains illuminated solid or continues to flash until the clus- ter receives a lamp-off message from the SKIM, or until the ignition switch is turned to the Off position, whichever occurs first. For more information on the SKIS and the security indicator control parameters, (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECU- RITY/SENTRY KEY IMMOBILIZER SYSTEM - OPERATION). † Communication Error - If the cluster receives no SKIS lamp-on or lamp-off messages from the SKIM for twenty consecutive seconds, the SKIS indi- cator is illuminated by the instrument cluster. The indicator remains controlled and illuminated by the cluster until a valid SKIS lamp-on or lamp-off mes- sage is received from the SKIM. † Actuator Test - Each time the instrument clus- ter is put through the actuator test, the security indi- cator will be turned on, then off again during the bulb check portion of the test to confirm the function- ality of the LED and the cluster control circuitry. The instrument cluster circuitry controls the secu- rity indicator whenever the ignition switch is in the Off position and the VTSS is arming, armed, or alarming. Whenever the ignition switch is in the On or Start positions, the SKIM performs a self-test to decide whether the SKIS is in good operating condi- tion and whether a valid key is present in the igni- tion lock cylinder. The SKIM then sends the proper lamp-on or lamp-off messages to the instrument clus- ter. For further diagnosis of the security indicator or the instrument cluster circuitry that controls the indicator, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). If the instrument cluster flashes the SKIS indicator upon ignition On, or turns on the SKIS indicator solid after the bulb test, it indicates that a SKIS malfunc- tion has occurred or that the SKIS is inoperative. For proper diagnosis of the VTSS, the SKIS, the SKIM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the security indi- cator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. SERVICE 4WD INDICATOR DESCRIPTION A service 4WD indicator is standard equipment on instrument clusters. However, on vehicles not all equipped with the optional four-wheel drive system and electronically shifted transfer case, this indicator is electronically disabled. The service 4WD indicator consists of the words “SERVICE 4x4”, which appears in the lower portion of the odometer/trip odometer INSTRUMENT CLUSTER 8J - 36 SERVICE 4WD INDICATOR (Continued) Vacuum Fluorescent Display (VFD) unit. The VFD is soldered onto the cluster electronic circuit board and is visible through a window with a smoked clear lens located on the lower edge of the tachometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents the indicator from being clearly visible when it is not illuminated. The words “SER- VICE 4x4” appear in an amber color and at the same lighting level as the odometer/trip odometer informa- tion when they are illuminated by the instrument cluster electronic circuit board. The service 4WD indicator is serviced as a unit with the VFD in the instrument cluster. OPERATION The service 4WD indicator gives an indication to the vehicle operator when the Transfer Case Control Module (TCCM) has recorded a Diagnostic Trouble Code (DTC) for an electronic transfer case circuit or component malfunction. This indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and elec- tronic messages received by the cluster from the TCCM over the Programmable Communications Interface (PCI) data bus. The service 4WD indicator is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indi- cator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the indicator will always be off when the ignition switch is in any position except On or Start. The indicator only illu- minates when it is switched to ground by the instru- ment cluster circuitry. The instrument cluster will turn on the service 4WD indicator for the following reasons: † Service 4WD Lamp-On Message - Each time the cluster receives a service 4WD lamp-on message from the TCCM, the indicator will be illuminated. The indicator remains illuminated until the cluster receives a service 4WD lamp-off message from the TCCM, or until the ignition switch is turned to the Off position, whichever occurs first. † Communication Error - If the cluster receives no messages from the TCCM for five seconds, the service 4WD indicator is illuminated by the instru- ment cluster to indicate a loss of TCCM communica- tion. and illuminated by the cluster until a valid message is received from the TCCM. † Actuator Test - Each time the cluster is put through the actuator test, the service 4WD indicator will be turned on, then off again during the VFD por- tion of the test to confirm the functionality of the VFD and the cluster control circuitry. controlled indicator remains The DR The TCCM continually monitors the electronic transfer case switch and circuits to determine the condition of the system. The TCCM then sends the proper lamp-on or lamp-off messages to the instru- ment cluster. For further diagnosis of the service 4WD indicator or the instrument cluster circuitry that controls the VFD, (Refer to 8 - ELECTRICAL/ INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). For proper diagnosis of the TCCM, the PCI data bus, or the electronic message inputs to the instrument cluster that control the service 4WD indi- cator, a DRBIIIt scan tool is required. Refer to the appropriate diagnostic information. SPEEDOMETER DESCRIPTION A speedometer is standard equipment on all instru- ment clusters. The speedometer is located next to the tachometer, just to the right of center in the instru- ment cluster. The speedometer consists of a movable gauge needle or pointer controlled by the instrument cluster circuitry and a fixed 210 degree primary scale on the gauge dial face that reads left-to-right either from “0” to “120” mph, or from “0” to “200” km/h, depending upon the market for which the vehicle is manufactured. Each version also has a secondary inner scale on the gauge dial face that provides the equivalent opposite units from the primary scale. Text appearing on the cluster overlay just below the hub of the speedometer needle abbreviates the unit of measure for the primary scale (i.e.: MPH or km/h), followed by the unit of measure for the secondary scale. The speedometer graphics are black (primary scale) and blue (secondary scale) against a white field, making them clearly visible within the instru- ment cluster in daylight. When illuminated from behind by the panel lamps dimmer controlled cluster illumination lighting with the exterior lamps turned On, the black graphics appear dark blue and the blue graphics appear light blue. The orange gauge needle is internally illuminated. Gauge illumination is pro- vided by replaceable incandescent bulb and bulb holder units located on the instrument cluster elec- tronic circuit board. The speedometer is serviced as a unit with the instrument cluster. OPERATION The speedometer gives an indication to the vehicle operator of the vehicle road speed. This gauge is con- trolled by the instrument cluster circuit board based upon cluster programming and electronic messages received by the cluster from the Powertrain Control Module (PCM) over the Programmable Communica- tions Interface (PCI) data bus. The speedometer is an DR SPEEDOMETER (Continued) air core magnetic unit that receives battery current on the instrument cluster electronic circuit board through the fused ignition switch output (run-start) circuit whenever the ignition switch is in the On or Start positions. The cluster is programmed to move the gauge needle back to the low end of the scale after the ignition switch is turned to the Off position. The instrument cluster circuitry controls the gauge needle position and provides the following features: † Vehicle Speed Message - Each time the clus- ter receives a vehicle speed message from the PCM it will calculate the correct vehicle speed reading and position the gauge needle at that relative speed posi- tion on the gauge scale. The cluster will receive a new vehicle speed message and reposition the gauge pointer accordingly about every 88 milliseconds. The gauge needle will continue to be positioned at the actual vehicle speed position on the gauge scale until the ignition switch is turned to the Off position. † Communication Error - If the cluster fails to receive a speedometer message, it will hold the gauge needle at the last indication for about three seconds, or until the ignition switch is turned to the Off posi- tion, whichever occurs first. After three seconds, the gauge needle will return to the left end of the gauge scale.† Actuator Test - Each time the cluster is put through the actuator test, the speedometer needle will be swept to several calibration points on the gauge scale in a prescribed sequence in order to con- firm the functionality of the gauge and the cluster control circuitry.

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2003 Dodge RAM Standard Owners Manual