2012 Mercedes-benz M Class Owners Manual

X Visit a qualified specialist workshop.

The left or right-hand trailer turn signal lamp is defective.

X Check whether you are permitted to change the bulb yourself.

or

X Visit a qualified specialist workshop.

The trailer brake lamp is defective.

X Check whether you are permitted to change the bulb yourself.

or

X Visit a qualified specialist workshop.

Display messages

251

Display messages

Possible causes/consequences and M Solutions

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

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 114).

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 114).

or

X Visit a qualified specialist workshop.

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 114).

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 114).

or

X Visit a qualified specialist workshop.

The left or right-hand brake lamp is defective.

X Check whether you are permitted to change the bulb yourself

(Y page 114).

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 114).

or

X Visit a qualified specialist workshop.

252 Display messages

Display messages

Possible causes/consequences and M Solutions

License Plate Lamp

Rear Fog Lamp

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 Left Tail Lamp or Check Right Tail Lamp

The license plate lamps are faulty.

X Check whether you are permitted to change the bulb yourself

(Y page 114).

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 114).

or

X Visit a qualified specialist workshop.

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 114).

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 114).

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 114).

or

X Visit a qualified specialist workshop.

The left or right-hand tail lamp is defective.

or

The rear left or right side marker lamp is defective.

X Check whether you are permitted to change the bulb yourself

(Y page 114).

or

X Visit a qualified specialist workshop.

Display messages

253

Display messages

Possible causes/consequences and M Solutions

Check Left Daytime Running Light or Check Right Daytime Running Light Active Headlamps Inoperative Malfunction See Operator's Manual AUTO Lamp Function Inoperative Switch Off Lights

The left or right-hand daytime running lamp is defective.

X Check whether you are permitted to change the bulb yourself

(Y page 114).

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.

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 Inoperative

Adaptive Highbeam Assist is faulty.

X Visit a qualified specialist workshop.

Adaptive Highbeam Assist Currently Unavailable See Operator's Manual

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.

254 Display messages

Engine

Display messages

Possible causes/consequences and M Solutions

Check Coolant Level See Operator's Manual

The coolant level is too low.

X Add coolant, observing the warning notes when doing so

(Y page 315).

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.

Display messages

255

Display messages

Possible causes/consequences and M Solutions

Coolant Level Low Stop Vehicle Turn Engine Off

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.

The poly-V-belt may have torn.

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 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 Visit a qualified specialist workshop.

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.

256 Display messages

Display messages

Possible causes/consequences and M Solutions

? The engine fan is defective.

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.

The engine oil level has dropped to the minimum level.

A warning tone also sounds.

X Check the engine oil level at the latest when next refueling

(Y page 313).

X If necessary, add engine oil (Y page 314).

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

engine checked at a qualified specialist workshop.

Check Engine Oil At Next Refueling

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.

Display messages

257

Display messages

Possible causes/consequences and M Solutions

The fuel level has dropped into the reserve range.

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

X Refuel at the nearest gas station.

X Refuel at the nearest gas station without fail.

Gas Cap Loose

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.

Ultra Low-sulfur Diesel Fuel Only

¸ Replace Air Filter

Check Fuel Filter

Ø Check Additive See Operator's Manual Ø Remaining Starts: 16

Vehicles with a diesel engine: the fuel level has fallen below the reserve range.

X Refuel at the nearest gas station.

X Only use commercially available vehicular ULTRA-LOW SULFUR

HIGHWAY DIESEL FUEL (ULSD, 15 ppm SULFUR MAXIMUM).

Vehicles with a diesel engine: the engine air filter is dirty and must be replaced.

X Visit a qualified specialist workshop.

Vehicles with a diesel engine: there is water in the fuel filter. The water must be drained off.

X Visit a qualified specialist workshop.

The DEF tank is empty.

X Have the DEF tank filled as soon as possible at a qualified

specialist workshop (Y page 152).

The DEF level has fallen to a minimum.

X Have the DEF tank filled immediately at a qualified specialist

workshop. (Y page 152)

258 Display messages

Driving systems

Display messages

Possible causes/consequences and M Solutions

À Attention Assist: Drowsiness Detected

À Attention Assist Inoperative Á Drive More Slowly

Á Compressor Is Cooling

Á Malfunction

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 aqu alified specialist workshop.

You cannot change the vehicle level. Possible causes are:

Ryou are driving too fast for the selected vehicle level.

Ryou are towing a trailer.

Rthe trailer-coupling socket is being used, e.g. for a bicycle rack.

X Drive more slowly and then select the desired vehicle level again

(Y page 181).

X Observe the notes on towing atra iler (Y page 210).

You have selected a higher vehicle level. The compressor first needs to cool down because of frequent level changes.

X Drive in a manner appropriate for the current vehicle level.

X Make sure that there is sufficient ground clearance.

X Allow the compressor to cool down.

When the compressor has cooled down, the display message disappears. The vehicle then continues rising to the selected level.

AIRMATIC is malfunctioning.

X Drive in a manner appropriate for the current vehicle level, but

no faster than 50 mph (80 km/h).

X Make sure that there is sufficient ground clearance.

X Have the vehicle checked at a qualified specialist workshop.

The Active Curve System is faulty. The vehicle's handling characteristics may be affected.

X Do not drive faster than 50 mph (80 km/h).

X Have the vehicle checked at a qualified specialist workshop.

Display messages

259

Display messages

Possible causes/consequences and M Solutions

Max. Speed 12 MPH

à Inoperative

HOLD Off

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

G Risk of accident

The Active Curve System is faulty. The vehicle's handling characteristics are severely impaired.

In addition, the vehicle level display appears between the vehicle icon and the display message, and a warning tone sounds.

X Do not drive faster than 12 mph (20 km/h).

X Adjust your driving style to the altered handling characteristics.

X Visit a qualified specialist workshop immediately.

DSR (Downhill Speed Regulation) is deactivated due to a malfunction.

X Have DSR checked at 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 179).

The radar sensor system is deactivated.

X Switch on the radar sensor system (Y page 236).

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 electric 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.

260 Display messages

Display messages

Possible causes/consequences and M Solutions

Lane Keeping Assist Inoperative or Active Lane Keeping Assist Inoperative

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

Park Assist Canceled

Lane Keeping Assist or Active Lane Keeping Assist is defective.

X Visit a qualified specialist workshop.

Blind Spot Assist or Active Blind Spot Assist is temporarily inoperative. Possible causes are:

Ryou have established the electrical connection between the

trailer and your vehicle.

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. X When towing a trailer, confirm the display message with a.

If you are driving without a trailer and 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 electric parking brake.

X Clean the sensors (Y page 322).

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.

The driver's door is open and the driver's seat belt has not been fastened.

X Repeat the parking process with the seat belt fastened and the

driver's door closed.

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261

Display messages

Possible causes/consequences and M Solutions

You have inadvertently touched the multifunction steering wheel while steering intervention was active.

X While steering intervention is active, make sure that the

multifunction steering wheel is not touched unintentionally.

The vehicle has started to skid and ESP® has intervened.

X Use Active Parking Assist again later (Y page 186).

Park Assist

Inoperative

You have just carried out a large number of turning or parking maneuvers.

Active Parking Assist will become available again after approximately 10 minutes (Y page 186).

X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Switch off and restart the engine.

If the display message continues to be displayed:

X Visit a qualified specialist workshop.

PARKTRONIC is defective.

X Visit a qualified specialist workshop.

The vehicle is parked. A warning tone also sounds.

The display message disappears automatically.

DISTRONIC PLUS has been deactivated (Y page 169). 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 169).

Park Assist Finished

DISTRONIC PLUS Off

DISTRONIC PLUS Now Available

262 Display messages

Display messages

Possible causes/consequences and M Solutions

DISTRONIC PLUS Currently Unavailable See Operator's Manual

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 Apply the electric parking brake.

X Clean the DISTRONIC PLUS cover in the radiator grille

(Y page 322).

X Clean the bumpers (Y page 322).

X Restart the engine.

If the system detects that the sensors are fully operational, the display message disappears.

DISTRONIC is operational again.

DISTRONIC PLUS Inoperative

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 aqu alified specialist workshop.

DISTRONIC PLUS Passive

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.

DISTRONIC PLUS

An activation condition for DISTRONIC PLUS is not fulfilled.

--- mph

X Check the activation conditions for DISTRONIC PLUS

(Y page 169).

Display messages

263

Display messages

Possible causes/consequences and M Solutions

Cruise Control Inoperative

Cruise Control --- mph

Cruise control is defective.

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 167).

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.

Display messages

Possible causes/consequences and M Solutions

Tire pressures will be displayed after driving a few minutes

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.

Tire Press. Monitor Inoperative

The tire pressure monitor is defective.

X Visit aqu alified specialist workshop.

Tire Press. Monitor Inoperative No Wheel Sensors

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.

264 Display messages

Display messages

Possible causes/consequences and M Solutions

Check Tires

Caution: Tire Malfunction

Correct Tire Pressure

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 359).

X If necessary, change a wheel (Y page 374).

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 374).

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 359).

X Restart the tire pressure monitor (Y page 361).

Tire Press. Sensor(s) Missing

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.

Tire Press. Warning Caution Tire Malfunction

X Drive on.

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 374).

Display messages

265

Display messages

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 374).

X Check the tire pressure. If necessary, correct the tire pressure

(Y page 359).

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 359).

Check Tire Pressure

Correct Tire Pressure

Vehicle

Display messages

Possible causes/consequences and M Solutions

Shift to 'P' or 'N' to Start Engine

You have attempted to start the engine with the transmission in position R or D.

X Shift the transmission to position P or N.

Auxiliary Battery Malfunction

The auxiliary battery for the automatic transmission is no longer being charged.

X Visit a qualified specialist workshop at the next opportunity.

X Until then, set the automatic transmission to position P before

you switch off the engine.

X Before leaving the vehicle, apply the electric parking brake.

Apply Brake to Shift from 'P'

You have attempted to move the transmission selector lever to position D, R or N without depressing the brake pedal.

X Depress the brake pedal.

Door Open Vehicle Not in 'P'

The driver's door is open and the transmission is in position R, N or D.

A warning tone also sounds.

X Shift the transmission to position P.

X Apply the electric parking brake.

266 Display messages

Display messages

Possible causes/consequences and M Solutions

Service Required Do Not Shift Gears Visit Dealer

You cannot change the transmission position due to a malfunction.

A warning tone also sounds.

If transmission position D is selected:

X Drive to a qualified specialist workshop without shifting the

transmission from position D.

If transmission position R, N or P is selected:

X Notify a qualified specialist workshop or breakdown service.

Only Shift to 'P' when Vehicle is Stationary

The vehicle is moving.

X Pull over and stop the vehicle safely as soon as possible, paying

attention to road and traffic conditions.

X Shift the transmission to position P.

A The tailgate is open. X Close the tailgate.

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 electric parking brake.

X Close the hood.

C At least one door is open.

Power Steering Malfunction See Operator's Manual

X Close all the doors.

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.

Display messages

267

Display messages

Possible causes/consequences and M Solutions

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 315).

SmartKey

Display messages

Possible causes/consequences and M Solutions

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

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 75).

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.

268 Display messages

Display messages

Possible causes/consequences and M Solutions

Key Not Detected (red display message)

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 electric 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 electric parking brake.

X Operate the vehicle with the SmartKey in the ignition lock.

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.

Key Not Detected (White display message)

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

Close Doors to Lock Vehicle

Warning and indicator lamps in the instrument cluster

269

Warning and indicator lamps in the instrument cluster

Seat belt

Problem

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.

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.

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 49).

G Risk of injury

The driver's seat belt is not fastened.

X Fasten your seat belt (Y page 49).

The warning tone ceases.

G Risk of injury

The driver or front passenger has not fastened their seat belt.

X Fasten your seat belt (Y page 49).

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.

270 Warning and indicator lamps in the instrument cluster

Problem

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. 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 49).

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

271

Safety systems

Problem

Possible causes/consequences and M Solutions

$ (USA only) J (Canada only)

The red brake system warning lamp comes on while the engine is running. A warning tone also sounds.

G Risk of accident

The brake boosting effect is malfunctioning and the braking characteristics may be affected.

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 electric parking brake.

X Consult a qualified specialist workshop.

X Observe the additional display messages in the multifunction

$ (USA only) J (Canada only)

The red brake system warning lamp comes on while the engine is running. A warning tone also sounds.

display.

G Risk of accident

There is not enough brake fluid in the brake fluid reservoir.

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 electric parking brake.

X Consult a qualified specialist workshop immediately.

X Observe the additional display messages in the multifunction

display.

Do not add brake fluid. This will not rectify the malfunction.

G WARNING Driving with the brake warning lamp illuminated can result in an accident. Have your brake system checked immediately if the brake warning lamp stays on. 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.

272 Warning and indicator lamps in the instrument cluster

Problem

The yellow ABS warning lamp is lit while the engine is running.

The yellow ABS warning lamp is lit while the engine is running.

Possible causes/consequences and M Solutions

G Risk of accident

ABS (Anti-lock Brake System) is deactivated due to a malfunction. BAS (Brake Assist), BAS PLUS, ESP® (Electronic Stability Program), PRE-SAFE®, PRE-SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are therefore also deactivated, for example.

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 Observe the additional display messages in the multifunction

display.

X Drive on carefully.

X Visit a qualified specialist workshop.

If the ABS control unit is faulty, there is also a possibility that other systems, such as the navigation system or the automatic transmission, will not be available.

G Risk of accident

ABS is temporarily unavailable. BAS, BAS PLUS, ESP®, EBD (electronic brake force distribution), PRE-SAFE®, PRE-SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are therefore also deactivated, for example.

Self diagnosis is not yet complete or the on-board voltage may be insufficient, for example.

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 Carefully drive a suitable distance making slight steering

movements at a speed above 12 mph (20 km/h). The functions mentioned above are available again when the warning lamp goes out.

If the warning lamp is still on:

X Observe the additional display messages in the multifunction

display.

X Drive on carefully.

X Visit a qualified specialist workshop.

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273

Problem

The yellow ABS warning lamp is lit while the engine is running. A warning tone also sounds.

Possible causes/consequences and M Solutions

G Risk of accident

EBD is faulty. Therefore, BAS, BAS PLUS, ESP®, PRE-SAFE®, PRE- SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are also unavailable, for example.

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 Observe the additional display messages in the multifunction

$ (USA only) J (Canada only) ֌!

The red brake warning lamp, the yellow ESP® and ESP® OFF warning lamps and the yellow ABS warning lamp are lit while the engine is running.

÷

The yellow ESP® warning lamp flashes while the vehicle is in motion.

display.

X Drive on carefully.

X Visit a qualified specialist workshop.

G Risk of accident

ABS and ESP® are faulty. Therefore, BAS, BAS PLUS, EBD, PRE- SAFE®, PRE-SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are also unavailable due to a malfunction, for example.

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 Observe the additional display messages in the multifunction

display.

X Drive on carefully.

X Visit a qualified specialist workshop.

G Risk of accident

ESP® or traction control has intervened because there is a risk of skidding or at least one wheel has started to spin.

Cruise control or DISTRONIC PLUS is deactivated.

X Only depress the accelerator pedal as far as necessary when

pulling away.

X Ease off the accelerator pedal while the vehicle is in motion.

X Adapt your driving style to suit the road and weather conditions.

X Do not deactivate ESP®.

Exceptions: (Y page 63).

274 Warning and indicator lamps in the instrument cluster