One or all of the indicator lamps in the seat heating* button are flashing.

There is insufficient voltage because too many consumers are switched on. The seat heating* has switched itself off automatically.

The indicator lamp in the button on the air-conditioning*/Thermotronic* control panel lights up. The cooling system cannot be switched on.

Cooling has been deactivated due to a malfunction.

The indicator lamp in the rear-window heating button is flashing. The rear-window heating has switched itself off prematurely or cannot be switched on.

There is insufficient voltage because too many consumers are switched on.

Vehicles with automatic child seat recognition on the front-passenger seat*:

The PASSENGER AIRBAG OFF warning lamp on the centre console is lit.

A special Mercedes-Benz child seat with automatic child seat recognition has been fitted to the front-passenger seat. The front-passenger airbag has therefore been disabled.

Vehicles with automatic child seat recognition on the front-passenger seat*:

The PASSENGER AIRBAG OFF warning lamp on the centre console is lit.

  Risk of injury

There is no child seat fitted to the front-passenger seat. The child seat recognition has malfunctioned.

Remove electronic equipment from the front-passenger seat, e.g.: Notebooks Mobile phones Cards with transponders, e.g. ski passes or access passes

If the PASSENGER AIRBAG OFF warning lamp is still lit:

Visit a qualified specialist workshop.

  Risk of accident

ABS has been deactivated due to a malfunction. The following systems have also been deactivated: ESP®, BAS, the Steer Assist function and the tyre pressure loss warning system.

The brake system continues to function normally, but without electronic support. The wheels could therefore lock if you brake hard, for example.

If the ABS control unit is faulty, there is also a possibility of malfunctions in other systems, such as Parktronic*, the navigation system* or AUTOTRONIC*.

  Risk of accident

ABS has been deactivated due to undervoltage. It is possible that the battery is not being charged.

Therefore, the following systems are, for example, also deactivated: ESP®, BAS, the Steer Assist function and the tyre pressure loss warning system.

The brake system continues to function normally, but without electronic support. The wheels could therefore lock if you brake hard, for example.

  Risk of accident

ESP® is not available due to a malfunction.

• BAS

• the Steer Assist function

• the tyre pressure loss warning system

The braking system remains available with full brake boosting effect but without the above functions.

  Risk of accident

ESP® has intervened because at least one wheel has started to spin.

  Risk of injury

The restraint systems are faulty. The airbags or belt tensioners may either be triggered unintentionally or, in the event of an accident, not be triggered at all.

The connector on the removable front-passenger seat* has not been connected.

You are driving with the handbrake applied.

  Risk of accident

There is insufficient brake fluid in the fluid reservoir.

Vehicles with a diesel engine: the fuel tank has run dry.

• in the fuel injection system or

• in the exhaust system or

• in the ignition system (on vehicles with a petrol engine)

The emission limit values may be exceeded and the engine may be running in emergency mode.

The seat belt warning lamp reminds the driver and front passenger to fasten their seat belts.

  Risk of injury

The driver's seat belt is not fastened.

  Risk of injury

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

  Risk of injury

There are objects on the front-passenger seat.

  Risk of injury

Either the driver's or the front-passenger seat belt is not fastened and you are driving faster than 25 km/h or have driven faster than 25 km/h for a short time.

  Risk of injury

There are objects on the front-passenger seat and you are driving faster than 25 km/h or have driven faster than 25 km/h for a short time.

The yellow segment display for the fuel tank lights up while the engine is running.

The level of fuel has fallen below the reserve range.

The anti-theft alarm system* is suddenly triggered.

You have opened the vehicle using the emergency key element without deactivating the anti-theft alarm system* first.

You hear a warning tone.

A message appears in the multi-function display.

You hear a warning tone.

You are driving with the handbrake applied.

You hear a warning tone.

You have opened the driver's door and forgotten to switch off the lights.

You hear a warning tone.

  Risk of injury

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

You hear a warning tone.

Vehicles with AUTOTRONIC*:

• switched off the engine

• opened the driver's door

• not moved the selector lever to position P

Fuel is leaking from the vehicle.

  Risk of fire

The fuel line or the fuel tank has been damaged.

	Switch off the ignition immediately.
	Remove the ignition key.
	Do not restart the engine under any circumstances.

The leaking fuel creates a risk of fire or explosion.

Consult a qualified specialist workshop.

You are unable to determine the extent of the damage.

You cannot detect any damage.

Fuel is leaking from the vehicle.

  Risk of fire

The fuel line or the fuel tank is defective.

	Turn the key to position 0 in the ignition lock immediately and remove it.
	Do not restart the engine under any circumstances.

The leaking fuel creates a risk of fire or explosion.

Consult a qualified specialist workshop.

The fuel filler flap cannot be opened.

The fuel filler flap is not released.

The opening mechanism is jammed.

The fuel tank has been run completely dry on a vehicle with a diesel engine.

There is air in the fuel system.

	Refuel the vehicle.
	Switch on the ignition for approximately 10 seconds (key in position 2 in the ignition lock).
	Start the engine continuously for up to 40 seconds until it runs smoothly.
	The fuel system is now free of air.

If the engine does not start:

	Wait two minutes.
	Repeat the starting procedure for up to 40 seconds.

If the engine still does not start:

Consult a qualified specialist workshop.

The engine will not start. You can hear the starter motor operating.

• There may be a malfunction in the engine electronics.

• There may be a malfunction in the fuel supply.

	Turn the key back to position 0 in the ignition lock before the next starting attempt.
	Try to start the engine again more. When doing so, remember that excessively long and frequent attempts to start the engine will drain the battery.

If the engine does not start after several attempts:

Consult a qualified specialist workshop.

Vehicles with a diesel engine:

The engine will not start. You can hear the starter motor operating. The reserve fuel warning lamp is on and the fuel gauge shows 0.

The fuel tank has been run dry.

The engine will not start. You cannot hear the starter motor operating.

The on-board voltage is too low because the starter battery is too weak or discharged.

Jump-start the vehicle more.

If the engine does not start despite attempting to jump-start it:

Consult a qualified specialist workshop.

Vehicles with a petrol engine:

The engine is not running smoothly and is misfiring.

The engine electronics or a mechanical component of the engine control unit have been damaged.

A coolant temperature of over 120 °C is displayed. The coolant warning lamp may also be on and a warning signal may sound more.

The coolant level is too low. The coolant is too hot and the engine is no longer being cooled sufficiently.

If the coolant level is correct, the radiator fan may be faulty. The coolant is too hot and the engine is no longer being cooled sufficiently.

The transmission has problems shifting gear

The transmission is losing oil.

The acceleration ability is deteriorating.

The one-touch gearshifting is no longer working.

The transmission no longer changes gear.

The transmission is in emergency mode.

Only the red segments in the Parktronic warning display are lit. You also hear a warning tone for approximately two seconds.

Parktronic is deactivated after approximately 20 seconds and the indicator lamp in the Parktronic button lights up.

Parktronic has malfunctioned and has switched itself off.

Only the red segments in the Parktronic warning display are lit. Parktronic is deactivated after approximately 20 seconds.

The Parktronic sensors are dirty or there is interference.

Only the red segments in the Parktronic warning display are lit. Parktronic is deactivated after approximately 20 seconds.

The problem may be caused by an external source of radio or ultrasound waves.

The headlamps or the turn signals in the exterior mirrors are misted up on the inside.

Air humidity is very high.

The headlamp housing is not sealed and moisture has been able to enter.

The windscreen wipers are jammed.

Leaves or snow, for example, may be obstructing the windscreen wiper movement. The wiper motor has been deactivated.

The windscreen wipers fail completely.

The windscreen wiper drive is malfunctioning.

A side window blocks while closing.

  Risk of injury

A side window blocks during automatic or manual closing. The closing procedure stops.

• An object has become trapped between the window and the door frame.

• There are objects in the window guide rail which are preventing the window from closing.

A side window blocks while closing.

  Risk of injury

You cannot see the cause.

The side window in the driver's door does not close fully when you pull the switch beyond the pressure point and then release it.

  Risk of injury

You cannot see the cause.

The side window in the driver's door stops during automatic closing, the closing procedure is interrupted and the window opens again slightly.

Pull and hold the switch until the side window in the driver's door is closed.

If the side window in the driver's door has opened again slightly:

	Pull the switch beyond the pressure point again within five seconds and then release it.
	The side window in the driver's door is closed without the anti-entrapment function.
	Make sure that nobody becomes trapped.

The anti-entrapment function is switched back on again automatically after approximately five seconds.

An exterior mirror has been pushed out of position.

Vehicles with exterior mirrors that cannot be folded in/out electrically:

Push the mirror into the correct position manually.

Vehicles with electrically folding exterior mirrors*:

	Press the mirror-folding button* more repeatedly until you hear a distinct click.
	The mirror housing is engaged again and you can adjust the mirror as usual more.

You cannot lock or unlock the vehicle using the key.

The key batteries are discharged or nearly discharged.

Point the tip of the key at the driver's door handle from close range and try to open the vehicle again.

If this does not work:

	Unlock the vehicle using the emergency key element more.
	Check the key batteries more and replace them if necessary more.

The key is faulty.

The battery charge indicator lamp of the key does not go on during the test.

The key batteries are discharged.

You have lost a key.

You have lost the emergency key element.

The key cannot be turned in the ignition lock.

The key has been in position 0 for a considerable time.

The on-board voltage is too low.

Switch off non-essential consumers, e.g. seat heating* or interior lighting, and try to turn the key again.

If this does not work:

	Check the starter battery and recharge it if necessary more.
or
	Jump-start the vehicle more.
or
	Consult a qualified specialist workshop.

The ball coupling cannot be locked.

The key cannot be removed from the ball coupling.

  Risk of accident

The ball coupling is dirty.

The trailer tow hitch is damaged.

The vehicle is to be left parked up for longer than six weeks.