2012 Mercedes-benz CLS Class Owners Manual

X Pull over and stop the vehicle safely, paying attention to road

and traffic conditions, and select a higher vehicle level. Depending on the malfunction, it may be possible to raise the vehicle.

X Visit a qualified specialist workshop. G Risk of accident The AIRMATIC function is restricted. The vehicle's handling characteristics may be affected. X Do not drive faster than 50 mph (80 km/h). 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 166).

The radar sensor system is deactivated. X Switch on the radar sensor system (Y page 211).

Display messages

231

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

Possible causes/consequences and M Solutions Lane Keeping Assist or Active Lane Keeping Assist is deactivated and temporarily inoperative if: Rthe windshield is dirty in the camera's field of vision. 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, for example by dirt

or snow.

Lane Keeping Assist or Active Lane Keeping Assist is operational again and the display message disappears if: Rthe dirt (e.g. slush) drops away while the vehicle is in motion. Rthe system recognizes that the camera is fully operational again. If the display message continues to be displayed: X Clean the windshield.

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 if: Rthe sensors are dirty. Rits function 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. Blind Spot Assist or Active Blind Spot Assist 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. Rthe radar sensor system is back within the operating

temperature range.

If the display message continues to be displayed: X Clean the sensors (Y page 289). X Restart the engine.

232 Display messages

Display messages Blind Spot Assist Inoperative or Active Blind Spot Assist Inoperative Park Assist Canceled

Park Assist Inoperative

Park Assist Finished DISTRONIC PLUS Off DISTRONIC PLUS Now Available

Possible causes/consequences and M Solutions 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.

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.

The vehicle has started to skid and ESP® has intervened. X Use Active Parking Assist again later (Y page 175). You have just performed a large number of turning or parking maneuvers. Active Parking Assist will become available again after approximately 10 minutes (Y page 175). 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. X If the warning message does not disappear: consult 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 157). 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 157).

Display messages

233

Display messages DISTRONIC PLUS Currently Unavailable See Operator's Manual

Possible causes/consequences and M Solutions DISTRONIC PLUS is deactivated and is temporarily inoperative if: Rthe DISTRONIC PLUS cover in the radiator grill is dirty. 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.

Rits function is impaired due to heavy rain or snow. Rthe system is outside the operating temperature range. Rthe on-board voltage is too low. A warning tone also sounds. DISTRONIC PLUS 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. 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 289).

X Clean the bumpers (Y page 289). X Restart the engine. 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 157).

DISTRONIC PLUS Inoperative

DISTRONIC PLUS Override

DISTRONIC PLUS --- mph

234 Display messages

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 155).

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

235

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 338).

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 321).

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 321). 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.

236 Display messages

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 322). X If necessary, change a wheel (Y page 338).

Caution: Tire Malfunction G Risk of accident

Correct Tire Pressure

Tire Press. Sensor(s) Missing

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 338). 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 322).

X Restart the tire pressure monitor (Y page 324). 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.

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 338).

Display messages

237

Display messages Check Tire Pressure

Correct Tire Pressure

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

Auxiliary Battery Malfunction

Apply Brake to Shift from 'P'

Door Open Vehicle Not in '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 338). X Check the tire pressure. If necessary, correct the tire pressure

(Y page 322).

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 322).

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.

The auxiliary battery for the automatic transmission is no longer being charged. X Visit a qualified specialist workshop. 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. 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 Engage the parking brake.

238 Display messages

Display messages Service Required Do Not Shift Gears Visit Dealer

Possible causes/consequences and M Solutions 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.

Only Shift to 'P' when Vehicle is Stationary

If transmission position R, N or P is selected: X Notify a qualified specialist workshop or breakdown service. 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.

N The trunk lid is open. X Close the trunk lid. 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 Engage the parking brake. X Close the hood.

C At least one door is open.

X Close all the doors. G Risk of injury The backrest in the rear is not engaged on the left-hand and/or right-hand side. X Push the backrest back until it engages.

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.

Rear Left Backrest Not Latched or Rear Right Backrest Not Latched Lock Seat Backrest Front Left or Lock Seat Backrest Front Right

Display messages

239

Display messages Power Steering Malfunction See Operator's Manual

Possible causes/consequences and M Solutions G Risk of accident The power steering assistance is defective. 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.

¥ Check Washer Fluid

The washer fluid level in the washer fluid reservoir has dropped below the minimum. X Add washer fluid (Y page 283).

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

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 76).

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.

240 Display messages

Display messages  Key Not Detected (Red display message)

 Key Not Detected (White display message)

 Key still in vehicle  Remove 'Start' Button and Insert Key

 Close Doors to Lock Vehicle

Possible causes/consequences and M Solutions 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 Engage 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. 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 Change the location of the key with the KEYLESS-GO functions

in the vehicle.

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

241

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 50).

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.

G Risk of injury The driver's seat belt is not fastened. X Fasten your seat belt (Y page 50).

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 50).

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.

242 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 50).

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

243

Safety systems Problem $ (USA only) J (Canada only) The red brake system warning lamp comes on while the engine is running. A warning tone also sounds.

$ (USA only) J (Canada only) The red brake system warning lamp comes on while the engine is running. A warning tone also sounds.

Possible causes/consequences and M Solutions 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 parking brake. X Consult a qualified specialist workshop. X Observe the additional display messages in the multifunction

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 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 correct 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.

244 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 and hill start assist 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. 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 are therefore also deactivated, for example. Self diagnosis is not yet complete. or For example, the on-board voltage may be insufficient. 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.

Warning and indicator lamps in the instrument cluster

245

Problem

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

$ (USA only) J (Canada only) ÷å! 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.

Possible causes/consequences and M Solutions G Risk of accident EBD is faulty. Therefore, ABS, BAS, BAS PLUS, ESP®, PRE-SAFE®, PRE-SAFE® Brake, the HOLD function and hill start assist 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

display.

X Drive on carefully. X Visit a qualified specialist workshop. G Risk of accident ABS and ESP® are faulty. Other systems, e.g. BAS, BAS PLUS, EBD, PRE-SAFE®, PRE-SAFE® Brake, the HOLD function and hill start assist, are also not available due to a malfunction. 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 Release 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®.

For exceptions: (Y page 63).

246 Warning and indicator lamps in the instrument cluster

Problem

å The yellow ESP® OFF warning lamp is lit while the engine is running.

Possible causes/consequences and M Solutions G Risk of accident ESP® is deactivated. ESP® will not stabilize the vehicle if it starts to skid or if a wheel starts to spin. X Reactivate ESP®.

AMG vehicles only: The yellow SPORT handling mode warning lamp is lit while the engine is running.

÷å The yellow ESP® and ESP® OFF warning lamps are lit while the engine is running.

For exceptions: (Y page 63).

X Adapt your driving style to suit the road and weather conditions. If ESP® cannot be activated: X Have ESP® checked at a qualified specialist workshop.

G Risk of accident SPORT handling mode is activated. ESP® only stabilizes the vehicle in extreme situations. ESP® intervention may not be able to provide sufficient assistance in such situations and the vehicle may start to skid. X Reactivate ESP®.

Exceptions: (Y page 63). If ESP® cannot be activated: X Have ESP® checked at a qualified specialist workshop.

G Risk of accident ESP®, BAS, BAS PLUS, PRE-SAFE®, PRE-SAFE® Brake, the HOLD function and hill start assist are not available due to a malfunction. ESP® will not stabilize the vehicle if it starts to skid or if a wheel starts to spin. The brake system continues to function normally, but without the functions listed above. ATTENTION ASSIST is deactivated. X Observe the additional display messages in the multifunction

display.

X Drive on carefully. X Visit a qualified specialist workshop.

Warning and indicator lamps in the instrument cluster

247

Problem $ (USA only) J (Canada only) The red brake system warning lamp comes on while the vehicle is moving. A warning tone also sounds.

The red SRS warning lamp is lit while the engine is running.

Possible causes/consequences and M Solutions You are driving with the parking brake applied. X Release the parking brake

The warning lamp goes out and the warning tone ceases.

G Risk of injury The restraint systems are malfunctioning. The air bags or ETDs may either be triggered unintentionally or, in the event of an accident, not be triggered at all. X Drive on carefully. X Visit a qualified specialist workshop immediately.

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.

248 Warning and indicator lamps in the instrument cluster

Engine Problem

The yellow Check Engine warning lamp lights up while the engine is running.

The yellow reserve fuel warning lamp flashes while the vehicle is in motion. In addition, the yellow Check Engine warning lamp ; may light up.

The yellow reserve fuel warning lamp lights up while the engine is running.

Possible causes/consequences and M Solutions There may be a malfunction, for example: Rin the engine management Rin the fuel injection system Rin the exhaust system Rin the ignition system Rin the fuel system The emission limit values may be exceeded and the engine may be running in emergency mode. X Have the vehicle checked as soon as possible at a qualified

specialist workshop.

i In some states, you are required by law to immediately visit a

qualified specialist workshop as soon as the yellow Check Engine warning lamp lights up. If in doubt, check whether such legal regulations apply in the state/province in which you are currently driving.

The fuel system pressure is too low. The fuel filler cap is not closed correctly or the fuel system is leaking. X Observe the additional display messages in the multifunction

display.

X Check that the fuel filler cap is correctly closed. X If the fuel filler cap is not correctly closed: close the fuel filler

X If the fuel filler cap is closed: visit a qualified specialist

cap.

workshop.

The fuel level has dropped into the reserve range. X Refuel at the nearest gas station.

Warning and indicator lamps in the instrument cluster

249

Problem

The red coolant warning lamp lights up while the engine is running and the coolant temperature gauge is at the start of the scale.

Possible causes/consequences and M Solutions The temperature sensor for the coolant temperature gauge is defective. The coolant temperature is no longer being monitored. There is a risk of engine damage if the coolant temperature is too high. X Pull over and stop the vehicle safely and switch off the engine, 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.

250 Warning and indicator lamps in the instrument cluster

Problem

The red coolant warning lamp comes on while the engine is running.

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

Possible causes/consequences and M Solutions The coolant level is too low. If the coolant level is correct, the airflow to the engine radiator may be blocked or the electric engine radiator fan may be malfunctioning. The coolant is too hot and the engine is no longer being cooled sufficiently. X Observe the additional display messages in the multifunction

display.

X Pull over and stop the vehicle safely and switch off the engine,

paying attention to road and traffic conditions.

X Allow the engine and coolant to cool. X Check the coolant level and add coolant (Y page 282). Observe

the warning notes.

X If you need to add coolant more often than usual, have the

engine coolant system checked.

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

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

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 coolant temperature has exceeded 248 ‡ (120 †). The airflow to the engine radiator may be blocked or the coolant level may be too low. The engine is not being cooled sufficiently and may be damaged. X Observe the additional display messages in the multifunction

display.

X Pull over and stop the vehicle safely and switch off the engine,

paying attention to road and traffic conditions.

X Allow the engine and coolant to cool. X Check the coolant level and add coolant (Y page 282). Observe

the warning notes.

X If you need to add coolant more often than usual, have the

engine coolant system checked.

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

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

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.

Warning and indicator lamps in the instrument cluster

251

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.

Driving systems Problem

· The red distance warning lamp lights up while the vehicle is in motion. A warning tone also sounds.

Possible causes/consequences and M Solutions G Risk of accident The warning is issued if you approach a stationary vehicle or a vehicle driving ahead of you at too high a speed. X Be prepared to brake immediately. X Pay careful attention to the traffic situation. You may have to

brake or take evasive action.

More information about DISTRONIC PLUS (Y page 157) and PRE-SAFE® Brake (Y page 67).

252 Warning and indicator lamps in the instrument cluster

Tires Problem

USA only: The yellow tire pressure monitor warning lamp (pressure loss/ malfunction) is lit. Canada only: The yellow tire pressure monitor warning lamp (pressure loss) is lit.

USA only: The yellow tire pressure monitor warning lamp (pressure loss/ malfunction) flashes for 60 seconds and then remains lit.

Possible causes/consequences and M Solutions G Risk of accident The tire pressure monitor has detected a loss of pressure in at least one of the tires. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so. X Observe the additional display messages in the multifunction

display.

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

(Y page 322).

X If necessary, change a wheel (Y page 338). The tire pressure monitor is faulty. X Observe the additional display messages in the multifunction

display.

X Visit a qualified specialist workshop.

G WARNING Each tire, including the spare (if provided), should be checked at least every two weeks when cold and inflated to the pressure recommended by the vehicle manufacturer on the Tire and Loading Information placard on the driver's door B-pillar or, if available, the tire pressure label on the inside of the fuel filler flap. If your vehicle has tires of a different size than the size indicated on the Tire and Loading Information placard or the tire pressure label, you should determine the proper tire pressure for those tires. As an added safety feature, your vehicle has been equipped with a tire pressure monitoring system (TPMS) that illuminates a low tire pressure telltale when one or more of your tires are significantly underinflated. Accordingly, when the low tire pressure telltale illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure. Driving on a significantly underinflated tire causes the tire to overheat and can lead to tire failure. Underinflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability. Please note that the TPMS is not a substitute for proper tire maintenance, and it is the driver's responsibility to maintain correct tire pressure, even if underinflation has not reached the level to trigger illumination of the TPMS low tire pressure telltale. USA only: Your vehicle has also been equipped with a TPMS malfunction indicator to indicate when the system is not operating properly. The TPMS malfunction indicator is combined with the low tire pressure telltale. When the system detects a malfunction, the telltale will flash for approximately 1 minute and then remain continuously illuminated. This sequence will continue upon subsequent

Warning and indicator lamps in the instrument cluster

253

vehicle start-ups as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of incompatible replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly. Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly.

254

255

Useful information ............................ 256
Loading guidelines ............................ 256
Stowage areas .................................. 256
Features ............................................. 261

256 Stowage areas

Useful information

i This Operator's Manual describes all models and all standard and optional equipment of your vehicle available at the time of publication of the Operator's Manual. Country-specific differences are possible. Please note that your vehicle may not be equipped with all features described. This also applies to safety- related systems and functions.

i Please read the information on qualified

specialist workshops (Y page 22).

Loading guidelines

G WARNING Always fasten items being carried as securely as possible. Use cargo tie-down rings and fastening materials appropriate for the weight and size of the load. In an accident, during hard braking or sudden maneuvers, loose items will be thrown around inside the vehicle. This can cause injury to vehicle occupants unless the items are securely fastened in the vehicle. To help avoid personal injury during a collision or sudden maneuver, exercise care when transporting cargo. Do not pile luggage or cargo higher than the seat backrests. The trunk is the preferred place to carry objects. Never drive a vehicle with the trunk open. Deadly carbon monoxide (CO) gases may enter vehicle interior resulting in unconsciousness and death.

The handling characteristics of a laden vehicle are dependent on the distribution of the load within the vehicle. For this reason, you should observe the following notes when transporting a load: Rwhen transporting a load, never exceed the maximum permissible gross vehicle weight or the gross axle weight rating of the

vehicle (including occupants). The values are specified on the vehicle identification plate on the B-pillar of the driver's door. Rposition heavy loads as far forwards as

possible and as low down in the trunk as possible.

Rthe load must not protrude above the upper

edge of the seat backrests.

Ralways place the load against the rear or front seat backrests. Make sure that the seat backrests are securely locked into place.

Ralways place the load behind unoccupied

seats if possible.

Rsecure the load with sufficiently strong and wear-resistant tie down. pad sharp edges for protection.

Stowage areas Stowage compartments Important safety notes G WARNING To help avoid personal injury during a collision or sudden maneuver, exercise care when storing objects in the vehicle. Put luggage or cargo in the trunk if possible. Do not pile luggage or cargo higher than the seat backrests. Keep compartment lids closed. This will help to prevent stored objects from being thrown about and injuring vehicle occupants during Rbraking Rvehicle maneuvers Ran accident

Stowage compartments in the front Glove box i The glove box can be ventilated

(Y page 128).

X To open: pull handle : and open glove box

flap ;.

X To close: fold glove box flap ; upwards

until it engages.

The glove box can only be locked and unlocked using the mechanical key.

X To lock: insert the mechanical key into the lock and turn it 90° clockwise to position 2.

X To unlock: insert the mechanical key into the lock and turn it 90° counter-clockwise to position 1.

Stowage areas

257

Stowage compartments in the center console

All models except AMG vehicles X To open: slide the cover forwards by

handle : in the direction of the arrow until it engages.

X To close: briefly press the front of

handle :.

AMG vehicles X Briefly press trim :.

Stowage compartment under the armrest i Depending on the vehicle's equipment, a 12 V socket, a USB socket, and an AUX IN connection or Media Interface are installed in the stowage compartment. A Media Interface is a universal interface for mobile audio equipment, e.g. for an iPod® or MP3
player (see the separate COMAND operating instructions).

258 Stowage areas

X To open: pull handle : upwards.

The armrest folds out.

Stowage compartment under the front seats

X To open: pull handle : up and fold

cover ; forwards.

Stowage compartments in the rear Stowage compartment in the rear seat armrest ! Do not sit or lean your bodyweight on the armrests when they are folded out as you could damage them.

! Close the cover of the stowage

compartment before folding the rear seat armrest back into the seat backrest.

X To open: fold down seat armrest ;. X Fold cover : of the armrest upwards.

Stowage pockets G WARNING Storage bags are intended for storing light- weight items only. Heavy objects, objects with sharp edges or fragile objects may not be transported in the storage bag. In an accident, during hard braking, or sudden maneuvers, they could be thrown around inside the vehicle and cause injury to vehicle occupants. Storage bags cannot protect transported goods in the event of an accident.

Storage bags are located in the rear compartment on the driver's and front- passenger seat backrests.

Parcel nets G WARNING Parcel nets are intended for storing light- weight items only, such as road maps, mail, etc. Heavy objects, objects with sharp edges, or fragile objects may not be transported in the parcel nets. In an accident, during hard braking, or sudden maneuvers, they could be thrown around inside the vehicle and cause injury to vehicle occupants. Parcel nets cannot protect transported goods in the event of an accident.

Stowage areas

259

X Vehicles without memory function: if necessary, move the driver's or front- passenger seat forwards.

X Open the trunk. X Pull right-hand or left-hand rear seat

backrest release handle :. The corresponding rear seat backrest is released.

X Fold rear seat backrest ; forwards. X Move the driver's or front-passenger seat

back if necessary.

Folding the seat backrest back

Parcel nets are located in the front-passenger footwell and on the left and right-hand sides of the trunk.

Rear bench seat through-loading feature Important safety notes G WARNING When expanding the cargo volume, always fold the seat backrests fully forward. Unless you are transporting cargo, the seat backrests must remain properly locked in the upright position. In an accident, during hard braking or sudden maneuvers, loose items will be thrown around inside the vehicle. This can cause injury to vehicle occupants unless the items are securely fastened in the vehicle. Always use the cargo tie-down rings.

The left-hand and right-hand rear seat backrests can be folded down separately to increase the trunk capacity.

Folding the seat backrest forward

i Vehicles with memory function: when you

fold one or both parts of the rear seat backrest forwards, the respective front seat moves forward slightly, when necessary, in order to avoid contact.

X Move the driver's or front-passenger seat

forward if necessary.

! Make sure that the seat belt does not

become trapped when folding the rear seat backrest back. Otherwise, it could be damaged.

X Fold rear seat backrest : back until it

engages.

260 Stowage areas