2003 Dodge RAM Standard Owners Manual

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and to the EMIC through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring infor- mation. The wiring information includes wiring dia- grams, proper wire and connector repair procedures, further details on wire harness routing and reten- tion, as well as pin-out and location views for the various wire harness connectors, splices and grounds. The EMIC modules for this model are serviced only as complete units. The EMIC module cannot be adjusted or repaired. If a gauge, an LED indicator, a VFD unit, the electronic circuit board, the circuit board hardware, the cluster overlay, or the EMIC housing are damaged or faulty, the entire EMIC mod- INSTRUMENT CLUSTER 8J - 6 INSTRUMENT CLUSTER (Continued) DR Fig.3Gauges&Indicators-GasolineEngine 1 - MALFUNCTION INDICATOR LAMP 2 - VOLTAGE GAUGE 3 - LEFT TURN INDICATOR 4 - TACHOMETER 5 - AIRBAG INDICATOR 6 - HIGH BEAM INDICATOR 7 - SEATBELT INDICATOR 8 - SPEEDOMETER 9 - RIGHT TURN INDICATOR 10 - OIL PRESSURE GAUGE 11 - CARGO LAMP INDICATOR 12 - DOOR AJAR INDICATOR 13 - ELECTRONIC THROTTLE CONTROL (ETC) INDICATOR 14 - ENGINE TEMPERATURE GAUGE 15 - SECURITY INDICATOR 16 - GEAR SELECTOR INDICATOR DISPLAY (INCLUDES CRUISE & UPSHIFT INDICATORS) 17 - CHECK GAUGES INDICATOR 18 - BRAKE INDICATOR 19 - ABS INDICATOR 20 - ODOMETER/TRIP ODOMETER DISPLAY (INCLUDES ENGINE HOURS, WASHER FLUID, LAMP OUTAGE, OVERDRIVE-OFF & SERVICE 4x4 INDICATORS) 21 - ODOMETER/TRIP ODOMETER SWITCH BUTTON 22 - FUEL GAUGE 23 - LOW FUEL INDICATOR 24 - TRANSMISSION OVERTEMP INDICATOR ule must be replaced. The cluster lens, hood and mask unit and the individual incandescent lamp bulbs with holders are available for individual ser- vice replacement. OPERATION The ElectroMechanical Instrument Cluster (EMIC) in this model also includes the hardware and soft- ware necessary to serve as the electronic body control module and is sometimes referred to as the Cab Compartment Node or CCN. The following informa- tion deals primarily with the instrument cluster functions of this unit. Additional details of the elec- tronic body control functions of this unit may be found within the service information for the system or component that the EMIC controls. For example: Additional details of the audible warning functions of the EMIC are found within the Chime/Buzzer service information. The EMIC is designed to allow the vehicle operator to monitor the conditions of many of the vehicle com- ponents and operating systems. The gauges and indi- cators in the EMIC provide valuable information about the various standard and optional powertrains, fuel and emissions systems, cooling systems, lighting systems, safety systems and many other convenience items. The EMIC is installed in the instrument panel so that all of these monitors can be easily viewed by the vehicle operator when driving, while still allow- ing relative ease of access for service. The micropro- cessor-based EMIC hardware and software uses various inputs to control the gauges and indicators visible on the face of the cluster. Some of these inputs are hard wired, but most are in the form of electronic messages that are transmitted by other electronic modules over the Programmable Communi- cations Interface (PCI) data bus network. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD- ULES/COMMUNICATION - OPERATION). DR INSTRUMENT CLUSTER (Continued) INSTRUMENT CLUSTER 8J - 7 1 - MALFUNCTION INDICATOR LAMP 2 - VOLTAGE GAUGE 3 - LEFT TURN INDICATOR 4 - TACHOMETER 5 - AIRBAG INDICATOR 6 - HIGH BEAM INDICATOR 7 - SEATBELT INDICATOR 8 - SPEEDOMETER 9 - RIGHT TURN INDICATOR 10 - OIL PRESSURE GAUGE 11 - CARGO LAMP INDICATOR 12 - DOOR AJAR INDICATOR 13 - ABS INDICATOR Fig.4Gauges&Indicators-DieselEngine 14 - ENGINE TEMPERATURE GAUGE 15 - SECURITY INDICATOR 16 - GEAR SELECTOR INDICATOR DISPLAY (INCLUDES CRUISE & UPSHIFT INDICATORS) 17 - WATER-IN-FUEL INDICATOR 18 - BRAKE INDICATOR 19 - WAIT-TO-START INDICATOR 20 - ODOMETER/TRIP ODOMETER DISPLAY (INCLUDES ENGINE HOURS, WASHER FLUID, LAMP OUTAGE, OVERDRIVE-OFF & SERVICE 4x4 INDICATORS) 21 - ODOMETER/TRIP ODOMETER SWITCH BUTTON 22 - FUEL GAUGE 23 - LOW FUEL INDICATOR 24 - TRANSMISSION OVERTEMP INDICATOR 25 - CHECK GAUGES INDICATOR The EMIC microprocessor smooths the input data using algorithms to provide gauge readings that are accurate, stable and responsive to operating condi- tions. These algorithms are designed to provide gauge readings during normal operation that are con- sistent with customer expectations. However, when abnormal conditions exist such as high coolant tem- perature, the algorithm can drive the gauge pointer to an extreme position and the microprocessor can sound a chime through the on-board audible tone generator to provide distinct visual and audible indi- cations of a problem to the vehicle operator. The instrument cluster circuitry may also produce audi- ble warnings for other electronic modules in the vehi- cle based upon electronic tone request messages received over the PCI data bus. Each audible warn- ing is intended to provide the vehicle operator with an audible alert to supplement a visual indication. The EMIC circuitry operates on battery current received through a fused B(+) fuse in the Integrated Power Module (IPM) on a non-switched fused B(+) circuit, and on battery current received through a fused ignition switch output (run-start) fuse in the IPM on a fused ignition switch output (run-start) cir- cuit. This arrangement allows the EMIC to provide some features regardless of the ignition switch posi- tion, while other features will operate only with the ignition switch in the On or Start positions. The EMIC circuitry is grounded through a ground circuit and take out of the instrument panel wire harness with an eyelet terminal connector that is secured by a ground screw to a ground location near the center of the instrument panel structural support. The EMIC also has a self-diagnostic actuator test capability, which will test each of the PCI bus mes- sage-controlled functions of the cluster by lighting the appropriate indicators, positioning the gauge nee- INSTRUMENT CLUSTER 8J - 8 INSTRUMENT CLUSTER (Continued) dles at several predetermined calibration points across the gauge faces, and illuminating all segments of the odometer/trip odometer and gear selector indi- cator Vacuum-Fluorescent Display (VFD) units. (Refer to 8 - ELECTRICAL/INSTRUMENT CLUS- TER - DIAGNOSIS AND TESTING). See the owner’s manual in the vehicle glove box for more information on the features, use and operation of the EMIC. GAUGES All gauges receive battery current through the EMIC circuitry only when the ignition switch is in the On or Start positions. With the ignition switch in the Off position battery current is not supplied to any gauges, and the EMIC circuitry is programmed to move all of the gauge needles back to the low end of their respective scales. Therefore, the gauges do not accurately indicate any vehicle condition unless the ignition switch is in the On or Start positions. All of the EMIC gauges are air core magnetic units. Two fixed electromagnetic coils are located within each gauge. These coils are wrapped at right angles to each other around a movable permanent magnet. The movable magnet is suspended within the coils on one end of a pivot shaft, while the gauge needle is attached to the other end of the shaft. One of the coils has a fixed current flowing through it to maintain a constant magnetic field strength. Current flow through the second coil changes, which causes changes in its magnetic field strength. The current flowing through the second coil is changed by the EMIC circuitry in response to messages received over the PCI data bus. The gauge needle moves as the movable permanent magnet aligns itself to the changing magnetic fields created around it by the electromagnets. The gauges are diagnosed using the EMIC self-di- agnostic actuator test. (Refer to 8 - ELECTRICAL/ INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). Proper testing of the PCI data bus and the electronic data bus message inputs to the EMIC that control each gauge require the use of a DRBIIIt scan tool. Refer to the appropriate diagnostic infor- mation. Specific operation details for each gauge may be found elsewhere in this service information. VACUUM-FLUORESCENT DISPLAYS The Vacuum-Fluorescent Display (VFD) units are soldered to the EMIC electronic circuit board. With the ignition switch in the Off or Accessory positions, the odometer display is activated when the driver door is opened (Rental Car mode) and is deactivated when the driver door is closed. Otherwise, both dis- play units are active when the ignition switch is in the On or Start positions, and inactive when the igni- tion switch is in the Off or Accessory positions. DR The illumination intensity of the VFD units is con- trolled by the EMIC circuitry based upon an input from the headlamp switch and a dimming level input received from the headlamp dimmer switch. The EMIC synchronizes the illumination intensity of other VFD units with that of the units in the EMIC by sending electronic dimming level messages to other electronic modules in the vehicle over the PCI data bus. The EMIC VFD units have several display capabil- ities including odometer, trip odometer, engine hours, gear selector indication (PRNDL) for models with an automatic transmission, several warning or reminder indications, and various diagnostic information when certain fault conditions exist. An odometer/trip odom- eter switch on the EMIC circuit board is used to con- trol some of the display modes. This switch is actuated manually by depressing the odometer/trip odometer switch button that extends through the lower edge of the cluster lens, just left of the tachom- eter. Actuating this switch momentarily with the ignition switch in the On position will toggle the VFD between the odometer and trip odometer modes. Depressing the switch button for about two seconds while the VFD is in the trip odometer mode will reset the trip odometer value to zero. While in the odometer mode with the ignition switch in the On position and the engine not running, depressing this switch for about six seconds will display the engine hours information. Holding this switch depressed while turning the ignition switch from the Off posi- tion to the On position will initiate the EMIC self-di- agnostic actuator test. Refer to the appropriate diagnostic information for additional details on this VFD function. The EMIC microprocessor remembers which display mode is active when the ignition switch is turned to the Off position, and returns the VFD display to that mode when the ignition switch is turned On again. The VFD units are diagnosed using the EMIC self- diagnostic actuator test. (Refer to 8 - ELECTRICAL/ INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). Proper testing of the PCI data bus and the electronic data bus message inputs to the EMIC that control some of the VFD functions requires the use of a DRBIIIt scan tool. Refer to the appropriate diagnostic information. Specific operation details for the odometer, the trip odometer, the gear selector indicator and the various warning and reminder indi- cator functions of the VFD may be found elsewhere in this service information. INDICATORS Indicators are located in various positions within the EMIC and are all connected to the EMIC elec- tronic circuit board. The cargo lamp indicator, door DR INSTRUMENT CLUSTER (Continued) INSTRUMENT CLUSTER 8J - 9 ajar indicator, high beam indicator, and turn signal indicators operate based upon hard wired inputs to the EMIC. The brake indicator is controlled by PCI data bus messages from the Controller Antilock Brake (CAB) as well as by hard wired park brake switch inputs to the EMIC. The seatbelt indicator is controlled by the EMIC programming, PCI data bus messages from the Airbag Control Module (ACM), and a hard wired seat belt switch input to the EMIC. The Malfunction Indicator Lamp (MIL) is normally controlled by PCI data bus messages from the Pow- ertrain Control Module (PCM); however, if the EMIC loses PCI data bus communication, the EMIC cir- cuitry will automatically turn the MIL on until PCI data bus communication is restored. The EMIC uses PCI data bus messages from the Front Control Mod- ule (FCM), the PCM, the diesel engine only Engine Control Module (ECM), the ACM, the CAB, and the Sentry Key Immobilizer Module (SKIM) to control all of the remaining indicators. The various EMIC indicators are controlled by dif- ferent strategies; some receive fused ignition switch output from the EMIC circuitry and have a switched ground, while others are grounded through the EMIC circuitry and have a switched battery feed. However, all indicators are completely controlled by the EMIC microprocessor based upon various hard wired and electronic message inputs. All indicators are illumi- nated at a fixed intensity, which is not affected by the selected illumination intensity of the EMIC gen- eral illumination lamps. In addition, certain indicators in this instrument cluster are automatically configured or self-config- ured. This feature allows the configurable indicators to be enabled by the EMIC circuitry for compatibility with certain optional equipment. The EMIC defaults for the ABS indicator and airbag indicator are enabled, and these configuration settings must be programmatically disabled in the EMIC using a DRBIIIt scan tool for vehicles that do not have this equipment. The automatically configured or self-con- figured indicators remain latent in each EMIC at all times and will be active only when the EMIC receives the appropriate PCI message inputs for that optional system or equipment. The hard wired indicator inputs may be diagnosed using conventional diagnostic methods. However, the EMIC circuitry and PCI bus message controlled indi- cators are diagnosed using the EMIC self-diagnostic actuator test. (Refer to 8 - ELECTRICAL/INSTRU- MENT CLUSTER - DIAGNOSIS AND TESTING). Proper testing of the PCI data bus and the electronic message inputs to the EMIC that control an indicator requires the use of a DRBIIIt scan tool. Refer to the appropriate diagnostic information. Specific details of the operation for each indicator may be found else- where in this service information. CLUSTER ILLUMINATION The EMIC has several illumination lamps that are illuminated when the exterior lighting is turned on with the headlamp switch. The illumination intensity of these lamps is adjusted when the interior lighting thumbwheel on the headlamp switch is rotated (down to dim, up to brighten) to one of six available minor detent positions. The EMIC monitors a resistor mul- tiplexed input from the headlamp switch on a dim- mer input circuit. In response to that input, the EMIC electronic circuitry converts a 12-volt input it receives from a fuse in the Integrated Power Module (IPM) on a hard wired panel lamps dimmer switch signal circuit into a 12-volt Pulse Width Modulated (PWM) output. The EMIC uses this PWM output to power the cluster illumination lamps and the VFD units on the EMIC circuit board, then provides a syn- chronized PWM output on the various hard wired fused panel lamps dimmer switch signal circuits to control and synchronize the illumination intensity of other incandescent illumination lamps in the vehicle. The cluster illumination lamps are grounded at all times. The EMIC also sends electronic dimming level messages over the PCI data bus to other electronic modules in the vehicle to control and synchronize the illumination intensity of their VFD units to that of the EMIC VFD units. In addition, the thumbwheel on the headlamp switch has a Parade Mode position to provide a parade mode. The EMIC monitors the request for this mode from the headlamp switch, then sends an electronic dimming level message over the PCI data bus to illuminate all VFD units in the vehicle at full (daytime) intensity for easier visibility when driving in daylight with the exterior lighting turned on. The hard wired headlamp switch and EMIC panel lamps dimmer inputs and outputs may be diagnosed using conventional diagnostic methods. However, proper testing of the PWM output of the EMIC and the electronic dimming level messages sent by the EMIC over the PCI data bus requires the use of a DRBIIIt scan tool. Refer to the appropriate diagnos- tic information. INPUT AND OUTPUT CIRCUITS HARD WIRED INPUTS lowing: The hard wired inputs to the EMIC include the fol- † Brake Lamp Switch Output † Driver Cylinder Lock Switch Sense † Driver Door Ajar Switch Sense INSTRUMENT CLUSTER 8J - 10 INSTRUMENT CLUSTER (Continued) † Driver Door Lock Switch MUX - with Power Locks † Fused B(+) - Ignition-Off Draw † Fused B(+) - Power Lock Feed - with Power Locks† Fused Ignition Switch Output (Accessory- Run)† Fused Ignition Switch Output (Off-Run- Start)† Fused Ignition Switch Output (Run-Start) † Headlamp Dimmer Switch MUX † Headlamp Switch MUX † Horn Relay Control † Key-In Ignition Switch Sense † Left Rear Door Ajar Switch Sense † Panel Lamps Dimmer Switch Signal † Park Brake Switch Sense † Passenger Door Ajar Switch Sense † Passenger Door Lock Switch MUX - with Power Locks † Radio Control MUX † Right Rear Door Ajar Switch Sense † RKE Supply - with RKE † Seat Belt Switch Sense † Transmission Range Sensor MUX - with † Turn/Hazard Switch MUX † Washer/Beam Select Switch MUX † Wiper Switch MUX Refer to the appropriate wiring information for Auto Trans additional details. HARD WIRED OUTPUTS following: The hard wired outputs of the EMIC include the † Accessory Switch Bank Illumination Driver † BTSI Driver - with Auto Trans † Cargo Lamp Driver † Dome/Overhead Lamp Driver † Driver Door Unlock Driver - with Power Locks† Headlamp Switch Illumination Driver † Heated Seat Switch Indicator Driver - with Heated Seats † Heater-A/C Control Illumination Driver † Left Door Lock Driver - with Power Locks † Left Rear Door Unlock Driver - with Power Locks† Map/Glove Box Lamp Driver DR † Radio Illumination Driver † Right Door Lock Driver - with Power Locks † Right Door Unlock Driver - with Power Locks† Transfer Case Switch Illumination Driver - with Four-Wheel Drive Refer to the appropriate wiring information for additional details. GROUNDS The EMIC receives and supplies a ground path to several switches and sensors through the following hard wired circuits: † Ground - Illumination (2 Circuits) † Ground - Power Lock - with Power Locks † Ground - Signal † Headlamp Switch Return † Multi-Function Switch Return † Transmission Range Sensor Return - with Refer to the appropriate wiring information for Auto Trans additional details. COMMUNICATION nication circuits: The EMIC has provisions for the following commu- † PCI Data Bus † RKE Program Serial Data - with RKE † RKE Transmit Serial Data - with RKE Refer to the appropriate wiring information for additional details. DIAGNOSIS AND TESTING - INSTRUMENT CLUSTER refer If all of the instrument cluster gauges and/or indi- cators are inoperative, to PRELIMINARY DIAGNOSIS. If an individual gauge or Programma- ble Communications Interface (PCI) data bus mes- sage-controlled indicator to ACTUATOR TEST. If an individual hard wired indi- cator is inoperative, refer to the diagnosis and testing information for that specific indicator. inoperative, refer is Refer to the appropriate 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 connectors, splices and grounds. INSTRUMENT CLUSTER 8J - 11 PRELIMINARY DIAGNOSIS 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 (1) Check the fused B(+) fuse (Fuse 28 - 10 ampere) in the Integrated Power Module (IPM). If OK, go to Step 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse. (2) Check for battery voltage at the fused B(+) fuse (Fuse 28 - 10 ampere) in the IPM. If OK, go to Step 3. If not OK, repair the open fused B(+) circuit between the IPM and the battery as required. (3) Disconnect and isolate the battery negative cable. Remove the instrument cluster. Reconnect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the instrument panel wire harness connector (Connector C1) for the instru- ment cluster. If OK, go to Step 4. If not OK, repair the open fused B(+) circuit between the instrument cluster and the IPM as required. (4) Check for continuity between the signal ground circuit cavity of the instrument panel wire harness connector (Connector C1) for the instrument cluster and a good ground. There should be continuity. If OK, refer to ACTUATOR TEST. If not OK, repair the open ground circuit to ground (G202) as required. DR INSTRUMENT CLUSTER (Continued) information critical CAUTION: Instrument clusters used in this model automatically configure themselves for compatibil- ity with the features and optional equipment in the vehicle in which they are initially installed. The instrument cluster is programmed to do this by embedding the Vehicle Identification Number (VIN) and other to proper cluster operation into electronic memory. This embedded information is learned through electronic messages received from other electronic modules in the vehi- cle over the Programmable Communications Inter- face (PCI) data bus, and through certain hard wired inputs received when the cluster is connected to the vehicle electrically. Once configured, the instru- ment cluster memory may be irreparably damaged and certain irreversible configuration errors may the cluster is connected electrically to occur if another vehicle; or, if an electronic module from another vehicle is connected that provides data to the instrument cluster (including odometer values) that conflicts with that which was previously learned and stored. Therefore, the practice of exchanging (swapping) instrument clusters and other electronic modules in this vehicle with those removed from another vehicle must always be avoided. Failure to observe this caution may result in instrument cluster damage, which is not reim- bursable under the terms of the product warranty. Service replacement instrument clusters are pro- vided with the correct VIN, and the certified odom- eter and engine hours values embedded into cluster memory, but will otherwise be automatically config- ured for compatibility with the features and optional equipment in the vehicle in which they are initially installed. indicator, the overdrive-off NOTE: Certain indicators in this instrument cluster are automatically configured. This feature allows those indicators to be activated or deactivated for compatibility with certain optional equipment. If the problem being diagnosed involves improper illumi- nation of the cruise indicator, the electronic throttle control the service four-wheel drive indicator, the transmission overtemp indicator, the upshift indicator, the secu- rity indicator or the gear selector indicator, discon- nect and isolate the battery negative cable. After about five minutes, reconnect the battery negative cable and turn the ignition switch to the On posi- tion. The instrument cluster should automatically relearn the equipment in the vehicle and properly configure the configurable indicators accordingly. indicator, INSTRUMENT CLUSTER 8J - 12 INSTRUMENT CLUSTER (Continued) ACTUATOR TEST 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 The instrument cluster actuator test will put the instrument cluster into its self-diagnostic mode. In this mode the instrument cluster can perform a self- diagnostic test that will confirm that the instrument cluster circuitry, the gauges, and the indicators are capable of operating as designed. During the actuator test the instrument cluster circuitry will position each of the gauge needles at various calibration points, illuminate all of the segments in the Vacuum Fluorescent Display (VFD) units, turn all of the indi- cators on and off again, display any Diagnostic Trou- ble Code (DTC) information, and display the number of ignition key cycles that have occurred since the DTC was detected. It is suggested that a note pad and pencil be used to write down any fault informa- tion that is displayed during the test for reference. the Powertrain Control Module (PCM), Successful completion of the actuator test will con- firm that the instrument cluster is operational. How- ever, there may still be a problem with the PCI data bus, the Engine Control Module (ECM), the Front Control Module (FCM), the Transmission Control Module (TCM), the Transfer Case Control Module (TCCM), the Airbag Control Module (ACM), the Controller Anti-lock Brake (CAB), or the inputs to one of these electronic control modules. Use a DRBIIIt scan tool DR to diagnose these components. Refer to the appropri- ate diagnostic information. (1) Begin the test with the ignition switch in the Off position. (2) Depress the odometer/trip odometer switch but- (3) While still holding the odometer/trip odometer switch button depressed, turn the ignition switch to the On position, but do not start the engine. (4) Release the odometer/trip odometer switch but- ton. ton. (5) The instrument cluster will simultaneously illuminate all of the operational segments in both VFD units, perform a bulb check of each operational LED indicator. The VFD segments and LED indica- tors remain illuminated as each gauge needle is swept to several calibration points and back. If a VFD segment or an LED indicator fails to illuminate, or if a gauge needle fails to sweep through the cali- bration points and back during this test, the instru- ment cluster must be replaced. Following these tests, the actuator test will proceed as described in Step 6. (6) The text “C Code” is displayed in the odometer VFD for about three seconds. If there is no stored fault information, the display will show two pairs of zeroes in the format “00” “00”, which indicate that the display of fault information is done. If there is stored fault information, two sets of two-digit alpha and alpha-numeric fault codes will appear in the odometer display for a three second interval. The first pair of digits represents a Diagnostic Trouble Code (DTC), or fault code for the instrument cluster. The second pair of digits is a counter for the number of ignition key cycles that have occurred since the displayed DTC was set. The instrument cluster will continue to display additional sets of two pairs of dig- its at three second intervals until all of the stored codes have been displayed, which is again signaled by a code of “00” “00”. Refer to the Instrument Clus- ter Failure Message table for a description of each fault code that the instrument cluster displays. If an instrument cluster fault is displayed, use a DRBIIIt scan tool to diagnose the problem. Refer to the appro- priate diagnostic information. Fault Code INSTRUMENT CLUSTER FAILURE MESSAGE Description Correction 01 02 03 04 05 06 Airbag warning indicator output circuit shorted. Airbag warning indicator output circuit open. ABS indicator output circuit shorted. ABS indicator output circuit open. MIL indicator output circuit shorted. MIL indicator output circuit open. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. DR INSTRUMENT CLUSTER (Continued) INSTRUMENT CLUSTER 8J - 13 Fault Code INSTRUMENT CLUSTER FAILURE MESSAGE Description Correction 07 08 0B 22 23 24 25 27 28 29 40 41 42 60 61 62 63 64 65 66 67 68 6C 6E 80 81 82 A0 A1 A3 A5 A7 A8 A9 AA AB AC Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Wait to start indicator circuit shorted. Wait to start indicator circuit open. BTSI output circuit shorted or open. Headlamp switch input circuit shorted. Headlamp switch input circuit open. Turn hazard switch input circuit shorted. Turn hazard swiitch inpot circuit open. Courtesy/dome output circuit shorted or open. Glovebox/map lamp output circuit shorted or open. Refer to the appropriate diagnostic information. Cargo lamp output circuit shorted or open. Refer to the appropriate diagnostic information. Wiper switch input circuit shorted. Refer to the appropriate diagnostic information. Wiper switch input circuit open. Wash/beam input circuit shorted. Refer to the appropriate diagnostic information. Passenger door lock switch input circuit shorted. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Passenger door lock switch input circuit open. Refer to the appropriate diagnostic information. Passenger door lock switch input circuit stuck. Refer to the appropriate diagnostic information. Driver door lock switch input circuit shorted. Driver door lock switch input circuit open. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Driver door lock switch input circuit stuck. All door lock output circuit shorted to ground or Refer to the appropriate diagnostic information. voltage. All door unlock output circuit shorted to ground or voltage. Driver door unlock output circuit shorted to ground or voltage. Driver cylinder lock switch input circuit shorted. Driver cylinder lock switch input circuit stuck. Incorrect odometer value found. Remote radio switch input circuit high. Remote radio switch stuck. Internal module FLASH memory checksum failure. Internal module bootloader failure. Battery voltage open. TCCM messages not received. VIN checksum error. VIN previously stored. PCI bus internal failure. PCM messages not received. TCM messages not received. ABS messages not received. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. INSTRUMENT CLUSTER 8J - 14 INSTRUMENT CLUSTER (Continued) DR Correction Fault Code AD AE AF B0 B1 00 INSTRUMENT CLUSTER FAILURE MESSAGE Description FCM messages not received. ACM messages not received. SKIM messages not received. RKE fob batteries low. RKE module communication link. Done Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. Refer to the appropriate diagnostic information. All Diagnostic Trouble Codes (DTC) have been displayed. (7) The actuator test is now completed. The instru- ment cluster will automatically exit the self-diagnos- tic mode and return to normal operation at the completion of the test, if the ignition switch is turned to the Off position during the test, or if a vehicle speed message indicating that the vehicle is moving is received from the PCM over the PCI data bus dur- ing the test. (8) Go back to Step 1 to repeat the test, if necessary. REMOVAL 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 (1) Disconnect and isolate the battery negative cable. (2) Remove the cluster bezel from the instrument panel. (Refer to 23 - BODY/INSTRUMENT PANEL/ CLUSTER BEZEL - REMOVAL). (3) Remove the four screws that secure the instru- ment cluster to the instrument panel structural sup- port (Fig. 5). Fig.5InstrumentClusterRemove/Install 1 - WIRE HARNESS CONNECTOR (3) 2 - INSTRUMENT CLUSTER 3 - SCREW (4) 4 - INSTRUMENT PANEL STRUCTURAL SUPPORT the (4) Pull instrument rearward far enough to access and disconnect the instrument panel wire harness connectors for the cluster from the connector receptacles on the back of the cluster housing. cluster (5) Remove the instrument cluster from the instru- ment panel. DISASSEMBLY Some of the components for the instrument cluster used in this vehicle are serviced individually. The serviced components include the incandescent instru- ment cluster illumination lamp bulbs (including the integral bulb holders), and the cluster lens, hood and mask unit. Following are the procedures for disas- sembling these components from the instrument clus- ter unit. DR INSTRUMENT CLUSTER (Continued) 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 CLUSTER BULB This procedure applies to each of the incandescent cluster illumination lamp bulb and bulb holder units. If the vehicle is equipped with the optional Remote Keyless Entry (RKE) system, the RKE receiver mod- ule must be removed from the instrument cluster rear cover to access the lower center cluster illumi- nation lamp, which is located on the circuit board directly behind the RKE module. (Refer to 8 - ELEC- TRICAL/POWER KEYLESS ENTRY MODULE - REMOVAL). LOCKS/REMOTE (1) Disconnect and isolate the battery negative cable. (2) Remove the instrument cluster from the instru- ment panel. (Refer to 8 - ELECTRICAL/INSTRU- MENT CLUSTER - REMOVAL). (3) Turn the bulb holder counterclockwise about sixty degrees on the cluster electronic circuit board (Fig. 6). INSTRUMENT CLUSTER 8J - 15 (4) Pull the bulb and bulb holder unit straight back to remove it from the bulb mounting hole in the cluster electronic circuit board. CLUSTER LENS, HOOD, AND MASK (1) Disconnect and isolate the battery negative cable. (2) Remove the instrument cluster from the instru- ment panel. (Refer to 8 - ELECTRICAL/INSTRU- MENT CLUSTER - REMOVAL). (3) From the back of cluster, remove the eight screws around the outer perimeter of the rear cover that secure the lens, hood, and mask unit to the cluster housing (Fig. 7). the instrument Fig.7InstrumentClusterComponents 1 - SCREW (9) 2 - REAR COVER 3 - CLUSTER HOUSING 4 - LENS, HOOD & MASK (4) Remove the lens, hood, and mask unit from the face of the instrument cluster. ASSEMBLY Some of the components for the instrument cluster used in this vehicle are serviced individually. The serviced components include the incandescent instru- ment cluster illumination lamp bulbs (including the integral bulb holders), and the cluster lens, hood and mask unit. Following are the procedures for assem- bling these components to the instrument cluster unit. Fig.6ClusterBulbRemove/Install 1 - INSTRUMENT CLUSTER 2 - BULB & HOLDER (11) INSTRUMENT CLUSTER 8J - 16 INSTRUMENT CLUSTER (Continued) 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 CLUSTER BULB This procedure applies to each of the incandescent cluster illumination lamp bulb and bulb holder units. If the vehicle is equipped with the optional Remote Keyless Entry (RKE) system, and the RKE receiver module was removed from the instrument cluster rear cover to access the lower center cluster illumi- nation lamp, reinstall the RKE module after the bulb is replaced on the circuit board. (Refer to 8 - ELEC- TRICAL/POWER KEYLESS LOCKS/REMOTE ENTRY MODULE - INSTALLATION). CAUTION: Always use the correct bulb size and type for replacement. An incorrect bulb size or type may overheat and cause damage to the instrument cluster, the gauges. the electronic circuit board and/or (1) Insert the bulb and bulb holder unit straight into the correct bulb mounting hole in the cluster electronic circuit board (Fig. 6). (2) With the bulb holder fully seated against the cluster electronic circuit board, turn the bulb holder clockwise about sixty degrees to lock it into place. (3) Reinstall the instrument cluster onto the instrument panel. (Refer to 8 - ELECTRICAL/IN- STRUMENT CLUSTER - INSTALLATION). (4) Reconnect the battery negative cable. DR CLUSTER LENS, HOOD, AND MASK (1) Position the cluster lens, hood, and mask unit over the face of the instrument cluster (Fig. 7). Be certain that the odometer/trip odometer switch but- ton is inserted through the proper clearance holes in the mask and the lens. (2) From the back of the instrument cluster, install and tighten the eight screws around the outer perim- eter of the rear cover that secure the lens, hood, and mask unit to the cluster housing. Tighten the screws to 1 N·m (10 in. lbs.). (3) Reinstall the instrument cluster onto the instrument panel. (Refer to 8 - ELECTRICAL/IN- STRUMENT CLUSTER - INSTALLATION). (4) Reconnect the battery negative cable. INSTALLATION 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 (1) Position the instrument cluster to the instru- ment panel. (2) Reconnect the instrument panel wire harness connectors for the cluster to the connector receptacles on the back of the cluster housing. (3) Position the instrument cluster into the instru- ment panel. (4) Install and tighten the four screws that secure the instrument cluster to the instrument panel struc- tural support (Fig. 5). Tighten the screws to 4 N·m (31 in. lbs.). (5) Reinstall the cluster bezel onto the instrument panel. (Refer to 23 - BODY/INSTRUMENT PANEL/ CLUSTER BEZEL - INSTALLATION). (6) Reconnect the battery negative cable. DR INSTRUMENT CLUSTER (Continued) INSTRUMENT CLUSTER 8J - 17 indicator, the overdrive-off NOTE: Certain indicators in this instrument cluster are automatically configured. This feature allows those indicators to be activated or deactivated for compatibility with certain optional equipment. If the problem being diagnosed involves improper illumi- nation of the cruise indicator, the electronic throttle control the service four-wheel drive indicator, the transmission overtemp indicator, the upshift indicator, the secu- rity indicator or the gear selector indicator, discon- nect and isolate the battery negative cable. After about five minutes, reconnect the battery negative cable and turn the ignition switch to the On posi- tion. The instrument cluster should automatically relearn the equipment in the vehicle and properly configure the configurable indicators accordingly. indicator, ABS INDICATOR DESCRIPTION An Antilock Brake System (ABS) indicator is stan- dard equipment on all instrument clusters. However, the instrument cluster can be programmed to disable this indicator on vehicles that are not equipped with the ABS or Rear Wheel Anti-Lock (RWAL) brake sys- tems, which are not available in some markets. On vehicles equipped with a gasoline engine, the ABS indicator is located near the lower edge of the instru- ment cluster, between the tachometer and the speed- ometer. On vehicles equipped with a diesel engine, the ABS indicator is located on the right side of the instrument cluster, to the right of the engine temper- ature gauge. The ABS indicator consists of a stencil- like cutout of the International Control and Display Symbol icon for “Failure of Anti-lock Braking Sys- tem” 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 indi- cator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic cir- cuit board. The ABS indicator is serviced as a unit with the instrument cluster. OPERATION The ABS indicator gives an indication to the vehi- cle operator when the ABS system is faulty or inop- erative. This indicator is controlled by a transistor on the instrument cluster circuit board based upon clus- ter programming and electronic messages received by the cluster from the Controller Antilock Brake (CAB) over the Programmable Communications Interface (PCI) data bus. The ABS 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 ABS indicator for the follow- ing reasons: † Bulb Test - Each time the ignition switch is turned to the On position the ABS indicator is illu- minated by the cluster for about two seconds as a bulb test. † ABS Lamp-On Message - Each time the clus- ter receives a lamp-on message from the CAB, the ABS indicator will be illuminated. The 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.† Communication Error - If the cluster receives no lamp-on or lamp-off messages from the CAB for three consecutive seconds, the ABS indicator is illu- minated. The indicator remains illuminated until the cluster receives a valid message from the CAB, or until the ignition switch is turned to the Off position, whichever occurs first. † Actuator Test - Each time the instrument clus- ter is put through the actuator test, the ABS indica- tor 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. † ABS Diagnostic Test - The ABS indicator is blinked on and off by lamp-on and lamp-off messages from the CAB during the performance of the ABS diagnostic tests. The CAB continually monitors the ABS circuits and sensors to decide whether the system is in good operating condition. The CAB then sends the proper 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

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2003 Dodge RAM Standard Owners Manual