Mercedes-Benz C-Class Manuals

Mercedes-Benz C-Class Owners Manual: Safety systems

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Possible causes/consequences and ► Solutions

Currently Unavailable See Operator's Manual

* ESP is temporarily unavailable.

Other driving systems and driving safety systems may also malfunction.

WARNING Risk of skidding if ESP is malfunctioning
If ESP is malfunctioning, ESP cannot carry out vehicle stabilization. In addition, other driving safety systems are switched off.
  • Drive on carefully.
  • Have ESP checked at a qualified specialist workshop.

  • Carefully drive on a suitable stretch of road, making slight steering movements at a speed above 19 mph (30 km/h).
  • If the display message does not disappear, consult a qualified specialist workshop immediately. Drive carefully.

Turn On the Ignition to Release the Parking Brake

* The red (USA only) or indicator lamp (Canada only) is lit.

You have attempted to release the electric parking brake with the ignition switched off.

  • Switch the ignition on.

Parking Brake See Operator's Manual

* The yellow indicator lamp is lit. The electric parking brake is malfunctioning.

To apply:

  • Switch off the ignition and switch it back on.
  • Apply the electric parking brake manually.

If it is not possible to apply the electric parking brake:

  • Visit a qualified specialist workshop.
  • Where necessary, also safeguard the parked vehicle against rolling away.

The yellow and the red (USA only) or (Canada only) indicator lamps are lit. The electric parking brake is malfunctioning.

To release:

  • Switch off the ignition and switch it back on.
  • Release the electric parking brake manually.
    or
  • Release the electric parking brake automatically.

    If it is still not possible to release the electric parking brake:

  • Do not continue driving under any circumstances. Consult a qualified specialist workshop.

    The yellowindicator lamp is lit and the red(USA only) or(Canada only) indicator lamp is flashing.

    The electric parking brake is malfunctioning.

    The electric parking brake could not be applied or released.

  • Switch off the ignition and switch it back on.

To apply:

  • Release and then apply the electric parking brake manually.

To release:

  • Apply and then release the electric parking brake manually.

If the electric parking brake cannot be applied or the red(USA only) or(Canada only) indicator lamp continues to flash:

  • Do not continue driving under any circumstances. Consult a qualified specialist workshop.
  • Where necessary, also safeguard the parked vehicle against rolling away.

    The yellowindicator lamp is on and the redindicator lamp (USA only) or the! indicator lamp (Canada only) flashes for approximately ten seconds after the electric parking brake has been applied or released. It then remains lit or goes out. The electric parking brake is malfunctioning.

If the battery charge level is too low:

  • Charge the battery.

To apply:

  • Switch off the ignition.

    The electric parking brake is applied automatically.

If the electric parking brake should not be applied, e.g. when washing the vehicle in an automatic car wash or when having the vehicle towed, leave the ignition switched on. This does not include having the vehicle towed with the rear axle raised.

If the electric parking brake is not applied automatically:

  • Switch off the ignition and switch it back on.
  • Release and then apply the electric parking brake manually.

If it is still not possible to apply the electric parking brake:

  • Visit a qualified specialist workshop.
  • Where necessary, also safeguard the parked vehicle against rolling away.

To release:

  • If the conditions for automatic release are fulfilled and the electric parking brake is not released automatically, release the electric parking brake manually.

If it is still not possible to release the electric parking brake:

  • Do not continue driving under any circumstances. Consult a qualified specialist workshop.

Please Release Parking Brake

* The red (USA only) or(Canada only) indicator lamp flashes.

The electric parking brake is applied while you are driving:

  • A condition for automatic release of the electric parking brake is not fulfilled.
  • You are performing emergency braking using the electric parking brake.
  • Check that the conditions for automatic release of the electric parking brake are fulfilled.
  • Release the electric parking brake manually.

Inoperative See Operator's Manual

* EBD, ABS and ESP are malfunctioning.

Other driving systems and driving safety systems may also malfunction.

WARNING Risk of skidding if EBD, ABS and ESP are malfunctioning
If EBD, ABS and ESP are malfunctioning, the wheels can lock when braking and ESP cannot carry out vehicle stabilization.

The steering capability and braking characteristics are thus severely impaired. The braking distance in an emergency braking situation can increase. In addition, other driving safety systems are switched off.

  • Drive on carefully.
  • Have the brake system checked immediately at a qualified specialist workshop.

  • Drive on carefully.
  • Visit a qualified specialist workshop immediately.

Check Brake Fluid Level

* There is insufficient brake fluid in the brake fluid reservoir.
WARNING Risk of an accident due to low brake fluid level
If the brake fluid level is too low, the braking effect and the braking characteristics may be impaired.
  • 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.

  • Consult a qualified specialist workshop.
  • Do not add brake fluid.
  • 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.
  • Do not add brake fluid.
  • Consult a qualified specialist workshop.
Radar Sensors Dirty See Operator's Manual * The radar sensor system is malfunctioning. Possible causes are:
  • Dirt on the sensors
  • Heavy rain or snow
  • Extended country driving without other traffic, e.g. in the desert

Driving systems and driving safety systems may be malfunctioning or temporarily unavailable.

Once the cause of the problem is no longer present, driving systems and driving safety systems will be available again.

If the display message does not disappear:

  • Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions.
  • Clean all sensors.
  • Restart the engine.

Currently Unavailable See Operator's Manual

* ABS and ESP are temporarily unavailable.

Other driving systems and driving safety systems may also be temporarily unavailable.

The brake system continues to operate normally. The braking distance in an emergency braking situation can increase.

WARNING Risk of skidding if ABS and ESP are malfunctioning
If ABS and ESP are malfunctioning, the wheels could lock when braking and ESP cannot carry out vehicle stabilization.

The steering capability and braking characteristics are thus severely impaired. The braking distance in an emergency braking situation can increase. In addition, other driving safety systems are switched off.

  • Drive on carefully.
  • Have ABS and ESP checked immediately at a qualified specialist workshop.

  • Carefully drive on a suitable stretch of road, making slight steering movements at a speed above 19 mph (30 km/h).
  • If the display message does not disappear, consult a qualified specialist workshop immediately. Drive carefully.

Inoperative See Operator's Manual

* ABS and ESP are malfunctioning.

Other driving systems and driving safety systems may also malfunction.

The brake system continues to operate normally. The braking distance in an emergency braking situation can increase.

WARNING Risk of skidding if ABS and ESP are malfunctioning
If ABS and ESP are malfunctioning, the wheels could lock when braking and ESP cannot carry out vehicle stabilization.

The steering capability and braking characteristics are thus severely impaired. The braking distance in an emergency braking situation can increase. In addition, other driving safety systems are switched off.

  • Drive on carefully.
  • Have ABS and ESP checked immediately at a qualified specialist workshop.

  • Drive on carefully.
  • Visit a qualified specialist workshop immediately.

Inoperative See Operator's Manual

* ESP is malfunctioning

Other driving systems and driving safety systems may also malfunction.

The brake system continues to operate normally. The braking distance in an emergency braking situation can increase.

WARNING Risk of skidding if ESP is malfunctioning
If ESP is malfunctioning, ESP cannot carry out vehicle stabilization. In addition, other driving safety systems are switched off.
  • Drive on carefully.
  • Have ESP checked at a qualified specialist workshop.
  • Drive on carefully.
  • Visit a qualified specialist workshop immediately.

Left Side Curtain Airbag Malfunction Service Required (Example)

* The corresponding window curtain airbag is malfunctioning.
WARNING Risk of injury or fatal injury due to malfunctions in the window airbag
If the window airbag is malfunctioning, it might be triggered unintentionally or might not be triggered at all in the event of an accident with high deceleration.
  • Have the window airbag checked and repaired immediately at a qualified specialist workshop.
  • Visit a qualified specialist workshop immediately.
Front Passenger Airbag Enabled See Operator's Manual * The front passenger airbag and knee airbags are enabled during the journey:
  • even when a child, a small adult or an object weighing less than the system weight threshold is located on the front passenger seat
  • even when the front passenger seat is not occupied

The system may detect objects or forces that are adding to the weight applied to the seat.

WARNING Risk of injury or fatal injury when using a child restraint system while the front passenger air bag is enabled
If you secure a child in a child restraint system on the front passenger seat and the front passenger air bag is enabled, the front passenger air bag can deploy in the event of an accident.

The child could be struck by the air bag.

  • Ensure, both before and during the journey, that the status of the front passenger air bag is correct.

NEVER use a rearward facing child restraint on a seat protected by an ACTIVE FRONT AIR BAG; DEATH or SERIOUS INJURY to the CHILD can occur.

  • Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions.
  • Check the status of the automatic front passenger airbag shutoff.
  • If necessary, consult a qualified specialist workshop immediately.
Front Passenger Airbag Disabled See Operator's Manual * The front passenger airbag and the knee airbag are deactivated, although an adult or a person with an adult stature is on the front passenger seat. If additional forces are applied to the seat, the weight the system detects may be too low.
WARNING Risk of injury or fatal injury due to a disabled front passenger airbag
If the front passenger airbag is disabled, the front passenger airbag will not be deployed in the event of an accident and cannot perform its intended protective function.

A person in the front passenger seat could then, for example, come into contact with the vehicle's interior, especially if the person is sitting too close to the cockpit.

  • Make sure, both before and during the journey, that the status of the front passenger airbag is correct.
  • Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions.
  • Check the status of the automatic front passenger airbag shutoff.
  • If necessary, consult a qualified specialist workshop immediately.
Active Brake Assist Functions Limited See Operator's Manual * Vehicles with Driving Assistance Package: Active Brake Assist with cross-traffic function, Evasive Steering Assist or PRE‑SAFE PLUS is malfunctioning.

Vehicles without Driving Assistance Package: Active Brake Assist is malfunctioning.

  • Visit a qualified specialist workshop.
PRE-SAFE Inoperative See Operator's Manual * PRE‑SAFE functions are malfunctioning.
  • Visit a qualified specialist workshop.
Mercedes me connect Services Limited See Operator's Manual * Service limited.

At least one of the main functions of the Mercedes me connect system is malfunctioning.

  • Observe the notes on the diagnostics connection.
  • Visit a qualified specialist workshop.

Inoperative

* At least one main function of the Mercedes me connect system or of the SOS emergency call system is malfunctioning.
  • Visit a qualified specialist workshop.

Front Left Malfunction Service Required (Example)

* The corresponding restraint system is faulty.
WARNING Risk of injury or fatal injury due to a malfunction in the restraint system
If the restraint system is malfunctioning, restraint system components may be triggered unintentionally or might not be triggered at all in the event of an accident. This may affect the Emergency Tensioning Device or airbag, for example.
  • Have the restraint system checked and repaired immediately at a qualified specialist workshop.

Detection of a restraint system malfunction:

  • The restraint system warning lamp does not light up when the ignition is switched on.
  • The restraint system warning lamp lights up continuously or repeatedly during a journey.
  • Visit a qualified specialist workshop immediately.
Active Brake Assist Functions Currently Limited See Operator's Manual * Vehicles with the Driving Assistance Package: Active Brake Assist with cross-traffic function, Evasive Steering Assist or PRE‑SAFE PLUS are temporarily unavailable or only partially available.

Vehicles without the Driving Assistance package: Active Brake Assist is temporarily unavailable.

The ambient conditions are outside the system limits.

  • Drive on.

    As soon as the ambient conditions are within the system limits, the system will become available again.

  • If the display message does not disappear, stop the vehicle while paying attention to road and traffic conditions and restart the engine.

SRS Malfunction Service Required

* The restraint system is faulty.
WARNING Risk of injury or fatal injury due to a malfunction in the restraint system
If the restraint system is malfunctioning, restraint system components may be triggered unintentionally or might not be triggered at all in the event of an accident. This may affect the Emergency Tensioning Device or airbag, for example.
  • Have the restraint system checked and repaired immediately at a qualified specialist workshop.

Detection of a restraint system malfunction:

  • The restraint system warning lamp does not light up when the ignition is switched on.
  • The restraint system warning lamp lights up continuously or repeatedly during a journey.
  • Visit a qualified specialist workshop immediately.
Check Brake Pads See Operator's Manual * The brake pads have reached the wear limit.
WARNING Risk of accident due to restricted braking power
When the brake pads have reached their wear limit, the braking power may be restricted.
  • Drive on carefully.
  • Have the brake system checked immediately at a qualified specialist workshop.
  • Visit a qualified specialist workshop.
    Introduction

    Driving systems

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