2011 Mercedes-benz C Class Coupe Owners Manual

Safety systems Display messages !÷ Currently Unavailable See Operator's Manual

Possible causes/consequences and M Solutions G Risk of accident ABS (Anti-lock Braking System), ESP® (Electronic Stability Program), BAS (Brake Assist), the HOLD function and hill start assist are temporarily unavailable. BAS PLUS and PRE-SAFE® Brake may also have failed. In addition, the ÷, å and ! warning lamps light up in the instrument cluster. The self-diagnosis function might not be complete, for example. ATTENTION ASSIST is deactivated. The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example. X Carefully drive a suitable distance making slight steering

movements at a speed above 12 mph (20 km/h). If the display message disappears, the functions mentioned above are available again.

If the display message continues to be displayed: X Drive on carefully. X Visit a qualified specialist workshop. G Risk of accident ABS, ESP®, BAS, the HOLD function and hill start assist are temporarily unavailable. BAS PLUS and PRE-SAFE® Brake may also have failed. In addition, the ÷, å and ! warning lamps light up in the instrument cluster. For example, the on-board voltage may be insufficient. ATTENTION ASSIST is deactivated. The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example. X Drive on carefully.

If the display message disappears, the functions mentioned above are available again.

If the display message continues to be displayed: X Drive on carefully. X Visit a qualified specialist workshop.

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Display messages !÷ Inoperative See Operator's Manual

÷ Currently Unavailable See Operator's Manual

Possible causes/consequences and M Solutions G Risk of accident ABS, ESP®, BAS, the HOLD function and hill start assist are unavailable due to a malfunction. BAS PLUS and PRE-SAFE® Brake may also have failed. The $ (USA only)/ J (Canada only), ÷, å and ! warning lamps in the instrument cluster also light up. The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example. ATTENTION ASSIST is deactivated. X Drive on carefully. X Visit a qualified specialist workshop immediately. G Risk of accident ESP®, BAS, the HOLD function and hill start assist are temporarily unavailable. BAS PLUS and PRE-SAFE® Brake may also have failed. In addition, the ÷ and å warning lamps light up in the instrument cluster. The self-diagnosis function might not be complete, for example. ATTENTION ASSIST is deactivated. The brake system continues to function normally, but without the functions listed above. X Carefully drive a suitable distance making slight steering

movements at a speed above 12 mph (20 km/h). If the display message disappears, the functions mentioned above are available again.

If the display message continues to be displayed: X Drive on carefully. X Visit a qualified specialist workshop.

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Possible causes/consequences and M Solutions G Risk of accident ESP®, BAS, the HOLD function and hill start assist are unavailable due to a malfunction. BAS PLUS and PRE-SAFE® Brake may also have failed. In addition, the ÷ and å warning lamps light up in the instrument cluster. ATTENTION ASSIST is deactivated. The brake system continues to function normally, but without the functions listed above. X Drive on carefully. X Visit a qualified specialist workshop. G Risk of accident EBD (electronic brake force distribution), ABS, ESP®, BAS, the HOLD function and hill start assist are unavailable due to a malfunction. BAS PLUS and PRE-SAFE® Brake may also have failed. In addition, the ÷, å and ! warning lamps light up in the instrument cluster and a warning tone sounds. ATTENTION ASSIST is deactivated. The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example. X Drive on carefully. X Visit a qualified specialist workshop immediately.

The brake pads/linings have reached their wear limit. X Visit a qualified specialist workshop.

You are driving with the parking brake applied. A warning tone also sounds. X Release the parking brake.

Display messages ÷ Inoperative See Operator's Manual

T! ÷ Inoperative See Operator's Manual

Check Brake Pad Wear $(USA only)J(Canada only) Release Parking Brake

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Display messages $(USA only)J(Canada only) Brake Immediately

$(USA only)J(Canada only) Check Brake Fluid Level

Possible causes/consequences and M Solutions A malfunction has occurred while the HOLD function or DISTRONIC PLUS is active. A tone may also sound at regular intervals. The tone becomes louder if you attempt to lock the vehicle. You cannot start the engine. X Paying attention to the traffic situation, immediately depress the

brake pedal firmly and hold until the display message disappears.

X Prevent the vehicle from rolling away before you leave it

(Y page 280). You can restart the engine. G Risk of accident There is not enough brake fluid in the brake fluid reservoir. Additionally, the red $ (USA only)/ J (Canada only) warning lamp lights up in the instrument cluster and a warning tone sounds. X Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not continue driving under any circumstances. X Engage the parking brake. X Consult a qualified specialist workshop. X Do not add brake fluid. This will not rectify the malfunction.

G WARNING Driving with the message Check Brake Fluid Level displayed can result in an accident. Have your brake system checked immediately. Do not add brake fluid before checking the brake system. Overfilling the brake fluid reservoir can result in spilling brake fluid on hot engine parts and the brake fluid catching fire. You can be seriously burned.

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Display messages Tele Aid Inoperative

PRE-SAFE Function Currently Limited See Oper. Manual

Possible causes/consequences and M Solutions USA only: one or more of the main functions in the mbrace system are malfunctioning. Canada only: one or more of the main functions of the TELEAID system are malfunctioning. X USA only: have the mbrace system checked at a qualified

specialist workshop.

X Canada only: have the TELEAID system checked at a qualified

specialist workshop.

G Risk of accident PRE-SAFE® Brake is temporarily inoperative if: Rthe DISTRONIC PLUS cover in the radiator grill is dirty. Rthe sensors in the bumpers are dirty. Rits function is impaired due to heavy rain or snow. Rthe radar sensor system is temporarily inoperative, e.g. due to

electromagnetic radiation emitted by nearby TV or radio stations or other sources of electromagnetic radiation.

Ryou switch off ESP® (AMG vehicles only). Rthe system is outside the operating temperature range. Rthe on-board voltage is too low. PRE-SAFE® Brake is operational again and the display message disappears if: Rthe dirt (e.g. slush) drops away while the vehicle is in motion. Rthe system detects that the sensors are fully available again. Ryou switch ESP® on again (AMG vehicles only). Rthe system is within the operating temperature range. If the display message continues to be displayed: X Clean the DISTRONIC PLUS cover in the radiator grill

(Y page 273).

X Clean the bumpers (Y page 273). X Restart the engine. X Wait until the battery is sufficiently charged. G Risk of accident PRE-SAFE® Brake is defective. BAS PLUS or the distance warning signal may also have failed. X Visit a qualified specialist workshop.

PRE-SAFE Functions Limited See Operator's Manual

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Display messages SRS Malfunction Service Required

Front Left Malfunction Service Required or Front Right Malfunction Service Required Rear Left Malfunction Service Required or Rear Right Malfunction Service Required Left Side Curtain Airbag Malfunction Service Required or Right Side Curtain Airbag Malfunction Service Required

Possible causes/consequences and M Solutions G Risk of injury There is a malfunction in the SRS (Supplemental Restraint System). The 6 warning lamp also lights up in the instrument cluster. X Visit a qualified specialist workshop. G Risk of injury SRS has malfunctioned at the front on the left or right. The 6
warning lamp also lights up in the instrument cluster. X Visit a qualified specialist workshop.

G Risk of injury SRS has malfunctioned at the rear on the left or right. The 6
warning lamp also lights up in the instrument cluster. X Visit a qualified specialist workshop.

G Risk of injury There is a malfunction in the left-hand and/or right-hand window curtain air bag. The 6 warning lamp also lights up in the instrument cluster. X Visit a qualified specialist workshop.

G WARNING In the event a malfunction of the SRS is indicated as outlined above, the SRS may not be operational. For your safety, we strongly recommend that you contact an authorized Mercedes-Benz Center immediately to have the system checked. Otherwise the SRS may not be activated when needed in an accident, which could result in serious or fatal injury, or it might deploy unexpectedly and unnecessarily which could also result in injury.

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Display messages Front Passenger Airbag Enabled See Operator's Manual

Possible causes/consequences and M Solutions The front-passenger air bag is enabled during the journey, even though: Ra child, a small adult or an object weighing less than the

system's weight threshold is located on the front-passenger seat.

Rthe front-passenger seat is unoccupied. The system may detect objects or forces applying additional weight on the seat. X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Engage the parking brake. X Switch off the ignition. X Open the front-passenger door. X Remove the child and the child restraint system from the front-

passenger seat.

X If necessary, secure the child in a child restraint system on a

suitable rear seat.

X Make sure that there are no objects on the seat adding to the

weight. The system may otherwise detect the additional weight and interpret the seat occupant's weight as greater than it actually is.

X Keep the seat unoccupied, close the front-passenger door and

switch on the ignition.

Observe the 45(Y page 42) indicator lamp and the multifunction display and check the following: Seat unoccupied and ignition switched on: Rthe 45 indicator lamp must light up and remain lit. When the indicator lamp is on, OCS (Y page 42) has deactivated the front-passenger air bag. Rthe Front Passenger Airbag Enabled See Operator's Manual or Front Passenger Airbag Disabl'd See Operator's Manual display messages must not appear in the multifunction display. Wait for a period of at least 60 seconds until the necessary system checks have been completed and to make sure that the display messages do not appear in the multifunction display.

If these conditions are fulfilled, the front-passenger seat can be occupied again. Whether the 45 indicator lamp remains lit or goes out depends on how OCS classifies the occupant. If the conditions are not fulfilled, the system is not operating correctly.

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Display messages

Possible causes/consequences and M Solutions X Visit a qualified specialist workshop immediately.

G WARNING If the 45 indicator lamp remains off even after performing the above corrective steps, do not have any children 12 years old and under and other small individuals use the front-passenger seat until the system has been repaired.

Display messages Front Passenger Airbag Disabl'd See Operator's Manual

Possible causes/consequences and M Solutions The front-passenger air bag is deactivated during the journey even though an adult or a person larger than a certain size is occupying the front-passenger seat. If additional forces are applied to the seat, the system may interpret the occupant's weight as lower than it actually is. X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Engage the parking brake. X Switch off the ignition. X Have the occupant get out of the vehicle. X Keep the seat unoccupied, close the front-passenger door and

switch on the ignition.

Observe the 45(Y page 42) indicator lamp and the multifunction display and check the following: Seat unoccupied and ignition switched on: Rthe 45 indicator lamp must light up and remain lit. When the indicator lamp is on, OCS (Y page 42) has deactivated the front-passenger air bag. Rthe Front Passenger Airbag Enabled See Operator's Manual or Front Passenger Airbag Disabled See Operator's Manual display messages must not appear in the multifunction display. Wait for a period of at least 60 seconds until the necessary system checks have been completed and to make sure that the display messages do not appear in the multifunction display.

If these conditions are fulfilled, the front-passenger seat can be occupied again. Whether the 45 indicator lamp remains lit or goes out depends on how OCS classifies the occupant. If the conditions are not fulfilled, the system is not operating correctly. X Visit a qualified specialist workshop immediately.

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G WARNING If the 45 indicator lamp remains lit with an adult occupant on the front-passenger seat even after performing the above corrective steps, do not have any passenger use the front- passenger seat until the system has been repaired.

Lights i Display messages about LEDs:

Possible causes/consequences and M Solutions The left or right-hand cornering light is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

This display message will only appear if all LEDs have failed. Display messages Check Left Cornering Light or Check Right Cornering Light Check Left Low Beam or Check Right Low Beam

or X Visit a qualified specialist workshop.

or X Visit a qualified specialist workshop.

(Y page 106).

The left or right-hand low-beam headlamp is defective. X Check whether you are permitted to change the bulb yourself

Check Rear Left Turn Signal or Check Rear Right Turn Signal Check Front Left Turn Signal or Check Front Right Turn Signal

The rear left-hand or rear right-hand turn signal is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The front left-hand or front right-hand turn signal is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

Display messages Check Left Mirror Turn Signal or Check Right Mirror Turn Signal Check Center Brake Lamp

Check Left Tail and Brake Lamps or Check Right Tail and Brake Lamps Check Left High Beam or Check Right High Beam

Check Left Fog Lamp or Check Right Fog Lamp

Rear Fog Lamp

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211

Possible causes/consequences and M Solutions The turn signal in the left-hand or right-hand exterior mirror is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop. The high-mounted brake lamp is faulty. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The left or right-hand tail lamp/brake lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The left or right-hand high beam is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The left-hand or right-hand front fog lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The rear fog lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

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Display messages Check Front Left Parking Lamp or Check Front Right Parking Lamp Backup Light

Check Front Left Sidemarker Lamp or Check Front Right Sidemarker Lamp Check Rear Left Sidemarker Lamp or Check Rear Right Sidemarker Lamp Check Left Daytime Running Light or Check Right Daytime Running Light Active Headlamps Inoperative Malfunction See Operator's Manual

Possible causes/consequences and M Solutions The front left or front right parking or standing lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The backup lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The left or right front side marker lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The rear left or right side marker lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The left or right-hand daytime running lamp is defective. X Check whether you are permitted to change the bulb yourself

(Y page 106).

or X Visit a qualified specialist workshop.

The active light function is defective. X Visit a qualified specialist workshop.

The exterior lighting is defective. X Visit a qualified specialist workshop.

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Display messages AUTO Lamp Function Inoperative Switch Off Lights Adaptive Highbeam Assist Inoperative Adaptive Highbeam Assist Currently Unavailable See Operator's Manual

Possible causes/consequences and M Solutions The light sensor is defective. X Visit a qualified specialist workshop.

The lights are still switched on when you leave the vehicle. A warning tone also sounds. X Turn the light switch to c or Ã.

Adaptive Highbeam Assist is faulty. X Visit a qualified specialist workshop.

Adaptive Highbeam Assist is deactivated and temporarily inoperative. Possible causes are: Rthe windshield in the camera's field of vision is dirty. Rvisibility is impaired due to heavy rain, snow or fog. X Clean the windshield. If the system detects that the camera is fully functional again, the Adaptive Highbeam Assist Now Available display message is shown. Adaptive Highbeam Assist is operational again.

Engine Display messages Check Coolant Level See Operator's Manual

Possible causes/consequences and M Solutions The coolant level is too low. X Add coolant, observing the warning notes when doing so

(Y page 266).

X If coolant needs to be added more often than usual, have the

engine coolant system checked at a qualified specialist workshop.

G WARNING Do not spill antifreeze on hot engine parts. Antifreeze contains ethylene glycol which may burn if it comes into contact with hot engine parts. You could be seriously burned.

! The coolant level is too low. Avoid making long journeys with too little coolant in the cooling

system. The engine will otherwise be damaged. The display messages and the corresponding symbol that indicate that the coolant level is too low must not be ignored.

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Display messages Coolant Level Low Stop Vehicle Turn Engine Off

Possible causes/consequences and M Solutions The coolant is too hot. X Pull over and stop the vehicle safely and switch off the engine,

paying attention to road and traffic conditions.

X Make sure that the air supply to the engine radiator is not

blocked, e.g. by snow, slush or ice.

X Wait until the display message disappears before restarting the

engine. Otherwise, there is a risk of engine damage.

X Pay attention to the coolant temperature display. X If the temperature increases again, visit a qualified specialist

workshop immediately.

G WARNING Driving when your engine is overheated can cause some fluids which may have leaked into the engine compartment to catch fire. You could be seriously burned. Steam from an overheated engine can cause serious burns which can occur just by opening the engine hood. Stay away from the engine if you see or hear steam coming from it. Stop the vehicle in a safe location away from other traffic. Turn off the engine, get out of the vehicle and do not stand near the vehicle until the engine has cooled down.

! If the coolant temperature exceeds 248 ‡(120 †) do not continue driving. The engine will

otherwise be damaged.

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Display messages ? The engine fan is defective.

Possible causes/consequences and M Solutions

X At coolant temperatures under 248 ‡ (120 † ), drive to the next

qualified specialist workshop.

X Avoid subjecting the engine to heavy loads, e.g. driving in

mountainous terrain, and stop-and-go traffic.

# The battery is not being charged.

Possible causes are: Ra defective alternator Ra torn poly-V-belt Ra malfunction in the electronics X Pull over and stop the vehicle safely and switch off the engine,

paying attention to road and traffic conditions.

X Open the hood. X Check whether the poly-V-belt is torn. If the poly-V-belt is torn: ! Do not continue driving. The engine could otherwise overheat. X Consult a qualified specialist workshop. If the poly-V-belt is not damaged: X Visit a qualified specialist workshop.

Check Engine Oil At Next Refueling

The oil level has dropped to the minimum level. A warning tone also sounds. X Check the oil level, at the latest when next refueling

(Y page 265).

X If necessary, add engine oil (Y page 265). X Have the engine checked at a qualified specialist workshop if

engine oil needs to be added more often than usual.

Information on approved engine oils can be obtained from any qualified specialist workshop or on the Internet at http://www.mbusa.com (USA only). ! The oil level is too low. Avoid long journeys with too little engine oil. There is a risk of

engine damage. The display messages and the corresponding symbol that indicate that the oil level is too low must not be ignored.

216 Display messages

Display messages Fuel Level Low C There is only a very small amount of fuel in the fuel tank.

Possible causes/consequences and M Solutions The fuel level has dropped into the reserve range. X Refuel at the nearest gas station.

Gas Cap Loose

Driving systems Display messages À Attention Assist: Drowsiness Detected

À Attention Assist Inoperative HOLD Off

X Refuel at the nearest gas station without fail. The fuel system pressure is too low. The fuel filler cap is not closed correctly or the fuel system is leaking. X Check that the fuel filler cap is correctly closed. If the fuel filler cap is not correctly closed: X Close the fuel filler cap. If the fuel filler cap is correctly closed: X Visit a qualified specialist workshop.

Possible causes/consequences and M Solutions Based on specific criteria, ATTENTION ASSIST has determined that the driver is tired or paying less attention. A warning tone also sounds. X If necessary, take a break. During long journeys, take regular breaks in good time so you get enough rest.

ATTENTION ASSIST has failed. X Visit a qualified specialist workshop.

The HOLD function is deactivated. The vehicle is skidding. A warning tone also sounds. X Reactivate the HOLD function later (Y page 159).

The HOLD function is deactivated. When the brake pedal is firmly depressed, an activation condition is not fulfilled. A warning tone also sounds. X Check the activation conditions for the HOLD function

(Y page 159).

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Display messages Radar Sensors Deactivated See Operator's Manual Lane Keeping Assist Currently Unavailable See Operator's Manual or Active Lane Keeping Assist Currently Unavailable See Operator's Manual

Lane Keeping Assist Inoperative or Active Lane Keeping Assist Inoperative

Possible causes/consequences and M Solutions The radar sensor system is deactivated. X Switch on the radar sensor system (Y page 196).

Lane Keeping Assist or Active Lane Keeping Assist is deactivated and temporarily inoperative. Possible causes are: Rthe windshield in the camera's field of vision is dirty. Rvisibility is impaired due to heavy rain, snow or fog. Rthere are no lane markings for a longer period. Rthe lane markings are worn, dark or covered, e.g. by dirt or snow. If the display message does not disappear: X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Apply the parking brake. X Clean the windshield. If the system detects that the camera is fully operational, the display message disappears. Lane Keeping Assist or Active Lane Keeping Assist is operational again.

Lane Keeping Assist or Active Lane Keeping Assist is defective. X Visit a qualified specialist workshop.

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Display messages Blind Spot Assist Currently Unavailable See Operator's Manual or Active Blind Spot Assist Currently Unavailable See Operator's Manual

Blind Spot Assist Inoperative or Active Blind Spot Assist Inoperative Parking Guidance Inoperative

Possible causes/consequences and M Solutions Blind Spot Assist or Active Blind Spot Assist is temporarily inoperative. Possible causes are: Rthe sensors are dirty. Rfunction is impaired due to heavy rain or snow. Rthe radar sensor system is outside the operating temperature

range.

Rthe radar sensor system is temporarily inoperative, e.g. due to

electromagnetic radiation emitted by nearby TV or radio stations or other sources of electromagnetic radiation.

The yellow 9 indicator lamps also light up in the exterior mirrors. If the display message does not disappear: X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Apply the parking brake. X Clean the sensors (Y page 273). X Restart the engine. If the system detects that the sensors are fully operational, the display message disappears. Blind Spot Assist or Active Blind Spot Assist is operational again. Blind Spot Assist or Active Blind Spot Assist is defective. The yellow 9 indicator lamps also light up in the exterior mirrors. X Visit a qualified specialist workshop.

Parking Guidance is malfunctioning (Y page 165). X Restart the engine. If the display message continues to be displayed: X Visit a qualified specialist workshop.

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Display messages Parking Guidance Canceled

Parking Guidance Finished DISTRONIC PLUS Off DISTRONIC PLUS Now Available

Possible causes/consequences and M Solutions Parking Guidance is deactivated. Possible causes are: RThe vehicle is skidding. Rthe sensors are dirty. Ra malfunction has occurred. A warning tone also sounds. X Reactivate Parking Guidance later (Y page 165). If the parking space symbol is not displayed in the multifunction display when you are driving at a speed of less than 19 mph (30 km/h): X Clean the sensors (Y page 273). X Restart the engine. If the parking space symbol is still not displayed in the multifunction display when you are driving at a speed of less than 19 mph (30 km/h): X Visit a qualified specialist workshop. Parking Guidance has been deactivated because you are no longer following the recommended path. X Park again and, while doing so, observe the display messages

in the multifunction display.

The vehicle is parked. A warning tone also sounds. The display message disappears automatically. DISTRONIC PLUS has been deactivated (Y page 148). If it was deactivated automatically, a warning tone also sounds.

DISTRONIC PLUS is operational again after having been temporarily unavailable. You can now reactivate DISTRONIC PLUS (Y page 148).

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Display messages DISTRONIC PLUS Currently Unavailable See Operator's Manual

DISTRONIC PLUS Inoperative

DISTRONIC PLUS Override

DISTRONIC PLUS --- mph

Possible causes/consequences and M Solutions DISTRONIC is deactivated and temporarily inoperative. Possible causes are: Rthe DISTRONIC PLUS cover in the radiator grille is dirty. Rfunction is impaired due to heavy rain or snow. Rthe sensors in the bumpers are dirty. Rthe radar sensor system is temporarily inoperative, e.g. due to

electromagnetic radiation emitted by nearby TV or radio stations or other sources of electromagnetic radiation. Rthe system is outside the operating temperature range. RThe on-board voltage is too low. A warning tone also sounds. If the display message does not disappear: X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Clean the DISTRONIC PLUS cover in the radiator grille

(Y page 273).

X Clean the bumpers (Y page 273). X Restart the engine. If the system detects that the sensors are fully operational, the display message disappears. DISTRONIC is operational again. DISTRONIC PLUS is defective. BAS PLUS (Brake Assist PLUS) and PRE-SAFE® Brake may be inoperative as well. A warning tone also sounds. X Visit a qualified specialist workshop. You have depressed the accelerator pedal. DISTRONIC PLUS is no longer controlling the speed of the vehicle. X Take your foot off the accelerator pedal. An activation condition for DISTRONIC PLUS is not fulfilled. X Check the activation conditions for DISTRONIC PLUS

(Y page 148).

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Display messages Cruise Control Inoperative

Cruise Control --- mph

Possible causes/consequences and M Solutions Cruise control is defective. A warning tone also sounds. X Visit a qualified specialist workshop.

A condition for activating cruise control has not been fulfilled. You attempted to save a speed of less than 20 mph (30 km/h). X If the situation allows, drive faster than 20 mph (30 km/h) and

save the speed.

X Check the activation conditions for cruise control

(Y page 146).

Tires G WARNING Do not drive with a flat tire. A flat tire affects the ability to steer or brake the vehicle. You may lose control of the vehicle. Continued driving with a flat tire will cause excessive heat build-up and possibly a fire. G WARNING Follow recommended tire inflation pressures. Do not underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect handling and fuel economy, and are more likely to fail from being overheated. Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear unevenly, increase stopping distance, and result in sudden deflation (blowout) because they are more likely to become punctured or damaged by road debris, potholes etc.

222 Display messages

Display messages Check Tire Pressure Soon

Possible causes/consequences and M Solutions G Risk of accident The tire pressure loss warning system has detected a significant loss in pressure. A warning tone also sounds. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so.

X Check the tires and, if necessary, change the wheel

X Check the tire pressures and, if necessary, set to the correct

(Y page 318).

tire pressure.

Check Tire Pressure Then Restart Run Flat Indicator

Run Flat Indicator Inoperative Tire pressures will be displayed after driving a few minutes Tire Press. Monitor Inoperative Tire Press. Monitor Inoperative No Wheel Sensors

X Restart the tire pressure loss warning system when the tire

pressure is correct (Y page 301).

The tire pressure loss warning system generated a display message and has not been restarted since. X Set the correct tire pressure in all four tires. X Restart the tire pressure loss warning system (Y page 301). The tire pressure loss warning system is defective. X Visit a qualified specialist workshop. The tire pressure monitor is measuring the tire pressure. X Drive on.

The tire pressures appear in the multifunction display after you have been driving for a few minutes.

The tire pressure monitor is defective. X Visit a qualified specialist workshop. The wheels mounted do not have a suitable tire pressure sensor. The tire pressure monitor is deactivated. X Mount wheels with suitable tire pressure sensors.

The tire pressure monitor is activated automatically after driving for a few minutes.

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Display messages Check Tires

Possible causes/consequences and M Solutions G Risk of accident The tire pressure in one or more tires has dropped significantly. The wheel position is displayed in the multifunction display. A warning tone also sounds. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so.

X Correct the tire pressure (Y page 303). X If necessary, change a wheel (Y page 318).

Caution: Tire Malfunction G Risk of accident

The tire pressure in one or more tires has dropped suddenly. The wheel position is displayed in the multifunction display. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so.

X If necessary, change a wheel (Y page 318). The tire pressure is too low in at least one of the tires or the tire pressure difference between the wheels is too great. X Check the tire pressures at the next opportunity. If necessary,

correct the tire pressure (Y page 303).

X Restart the tire pressure monitor (Y page 305). There is no signal from the tire pressure sensor of one or several wheels. The pressure of the affected tire is not displayed in the multifunction display. X Have the defective tire pressure sensor replaced at a qualified

specialist workshop.

Tire Press. Monitor Currently Unavail. Due to a source of radio interference, no signals can be received

from the wheel sensors. The tire pressure monitor is temporarily malfunctioning. X Drive on.

Correct Tire Pressure

Tire Press. Sensor(s) Missing

Tire Press. Warning Caution Tire Malfunction

The tire pressure monitor restarts automatically as soon as the problem has been solved. G Risk of accident The tire pressure in one or more tires has dropped suddenly. A warning tone also sounds. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so.

X If necessary, change a wheel (Y page 318).

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Display messages Check Tire Pressure

Correct Tire Pressure

Vehicle Display messages Shift to 'P' or 'N' to Start Engine

Shift to 'P'

Possible causes/consequences and M Solutions G Risk of accident The tire pressure in one or more tires has dropped significantly. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so.

X If necessary, change a wheel (Y page 318). X Check the tire pressure. If necessary, correct the tire pressure

(Y page 303).

The tire pressure is too low in at least one of the tires or the tire pressure difference between the wheels is too great. X Check the tire pressures at the next opportunity. If necessary,

correct the tire pressure (Y page 303).

Possible causes/consequences and M Solutions You have attempted to start the engine with the transmission in position R or D. X Shift the transmission to position P or N.

You have attempted to stop the engine with the Start/Stop button while the transmission was not in position P. X Shift the transmission to position P. While the HOLD function or DISTRONIC PLUS is active, you have: Ropened the driver's door and released the seat belt or Rswitched off the engine or Ropened the hood A tone may also sound at regular intervals. The tone becomes louder if you attempt to lock the vehicle. You cannot start the engine. X Shift the transmission to position P.

You can restart the engine.

N The trunk lid is open. X Close the trunk lid.

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Display messages

Possible causes/consequences and M Solutions G Risk of accident The hood is open. X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Apply the parking brake. X Close the hood.

C At least one door is open.

X Close all the doors.

Lock Seat Backrest Front Left or Lock Seat Backrest Front Right Power Steering Malfunction See Operator's Manual

The driver's or front passenger's seat backrest is not engaged. A warning tone also sounds. X Push the backrest back until it engages.

G Risk of accident The power steering is malfunctioning. You will need to use more force to steer. A warning tone also sounds. X Check whether you are able to apply the extra force required. X If you are able to steer safely: carefully drive on to a qualified

specialist workshop.

X If you are unable to steer safely: do not drive on. Contact the

nearest qualified specialist workshop.

Phone No Service

Your vehicle is outside the network provider's transmitter/ receiver range. X Wait until the mobile phone operational readiness symbol

appears in the multifunction display.

¥ Check Washer Fluid

The washer fluid level in the washer fluid reservoir has dropped below the minimum. X Add washer fluid (Y page 267).

226 Display messages

SmartKey Display messages  Key Does Not Belong to Vehicle  Take Your Key from Ignition  Obtain a New Key  Replace Key Battery  Don't Forget Your Key

 Key Not Detected (red display message)

Possible causes/consequences and M Solutions You have put the wrong SmartKey in the ignition lock. X Use the correct SmartKey.

The SmartKey is in the ignition lock. X Remove the SmartKey.

The SmartKey needs to be replaced. X Visit a qualified specialist workshop.

The batteries of the KEYLESS-GO key are discharged. X Change the batteries (Y page 72).

The display message is shown for a maximum of 60 seconds and is only a reminder. You have opened the driver's door with the engine switched off. The KEYLESS-GO key is not in the ignition lock. X Remember to take the KEYLESS-GO key with you when you

leave the vehicle.

The KEYLESS-GO key is not in the vehicle. A warning tone also sounds. If the engine is switched off, you can no longer lock the vehicle centrally or start the engine. X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Apply the parking brake. X Locate the KEYLESS-GO key. The KEYLESS-GO key is not detected while the engine is running because there is interference from a strong source of radio waves. A warning tone also sounds. X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Engage the parking brake. X Operate the vehicle with the SmartKey in the ignition lock.

Warning and indicator lamps in the instrument cluster

227

Display messages  Key Not Detected (White display message)

 Key Detected in Vehicle  Remove 'Start' Button and Insert Key

 Close Doors to Lock Vehicle

Possible causes/consequences and M Solutions The KEYLESS-GO key cannot be detected at present. X Change the location of the key with the KEYLESS-GO functions

in the vehicle.

If the KEYLESS-GO key is still not detected: X Operate the vehicle with the SmartKey in the ignition lock. The KEYLESS-GO key has been detected inside the vehicle during locking. X Remove the KEYLESS-GO key from the vehicle.

KEYLESS-GO is temporarily malfunctioning or is defective. A warning tone also sounds. X Insert the SmartKey into the ignition lock and turn it to the

desired position.

X Visit a qualified specialist workshop. At least one door is open. A warning tone also sounds. X Close all doors and lock the vehicle again.

Warning and indicator lamps in the instrument cluster Seat belts Problem

Possible causes/consequences and M Solutions The seat belt warning lamp reminds the driver and front passenger to fasten their seat belts. X Fasten your seat belt (Y page 48).

After starting the engine, the red seat belt warning lamp lights up for six seconds.

After starting the engine, the red seat belt warning lamp lights up. In addition, a warning tone sounds for up to six seconds.

G Risk of injury The driver's seat belt is not fastened. X Fasten your seat belt (Y page 48).

The warning tone ceases.

228 Warning and indicator lamps in the instrument cluster

Problem

The red seat belt warning lamp lights up after the engine starts, as soon as the driver's or the front-passenger door is closed.

The red seat belt warning lamp flashes and an intermittent audible warning sounds.

Possible causes/consequences and M Solutions G Risk of injury The driver or front passenger has not fastened their seat belt. X Fasten your seat belt (Y page 48).

The warning lamp goes out. G Risk of injury There are objects on the front-passenger seat. X Remove the objects from the front-passenger seat and stow

them in a secure place. The warning lamp goes out. G Risk of injury The driver or front passenger has not fastened their seat belt. In addition, you are driving faster than 15 mph (25 km/h) or you have briefly driven faster than 15 mph (25 km/h). X Fasten your seat belt (Y page 48).

The warning lamp goes out and the intermittent warning tone ceases. G Risk of injury There are objects on the front-passenger seat. In addition, you are driving faster than 15 mph (25 km/h) or you have briefly driven faster than 15 mph (25 km/h). X Remove the objects from the front-passenger seat and stow

them in a secure place. The warning lamp goes out and the intermittent warning tone ceases.

Warning and indicator lamps in the instrument cluster