Mercedes-Benz B-Class Quiz
On-board computer and displays

Safety systems

In this manual: On-board computer and displays
Introduction — 16At a glance — 11Safety — 27Opening and closing — 33Seats, steering wheel and mirrors — 21Lighting and windshield wipers — 25Air conditioning — 27Driving and parking — 66On-board computer and displays — 35Storage and other — 21Maintenance and care — 10Flat tire assistance — 26Wheels and tires — 26Technical data — 22
~14min read




Displaying messages Possible causes/consequences and solutions
cf. notice d'utilisationNot available at the moment
see Operator's Manual		 ABS (Anti-lock Braking System), ESP® (Electronic Stability Program), BAS (Brake Assist System), PRE-SAFE® system, HOLD function, Hill Start Assist and trailer stabilization with ESP® are not available at the moment.

Adaptive brake lights and Adaptive Brake Assist may also be malfunctioning.

In addition, the warning lampset,
qui se trouvent sur le combinéand
d'instruments sont allumés.in the instrument cluster are illuminated.

The ATTENTION ASSIST system is deactivated.

Possible causes:

  • The self-diagnosis is not yet complete.
  • The vehicle electrical system voltage may be too low.

WARNING

The braking system continues to operate with its normal efficiency, but without the functions listed above. The wheels may lock, for example during full braking.

The vehicle's handling during braking is then limited and the braking distance may be longer.

If ESP® is deactivated or not operational, vehicle stability is reduced during standard manoeuvres.

There is a risk of an accident.

  • Drive a short, slightly winding route at more than 20 km/h, driving carefully.

If the message disappears, the functions listed above are available again.

If the message remains displayed:

  • Continue driving carefully.
  • Visit a qualified workshop.
notice d'utilisationNot working, see
Operator's Manual		 ABS, ESP®, BAS, PRE-SAFE® system, HOLD function, Hill Start Assist and trailer stabilization with ESP® are not available due to a malfunction.

Adaptive brake lights and Adaptive Brake Assist may also be malfunctioning.

In addition, the warning lamps,,
et,
qui se trouvent sur le combinéand
d'instruments sont allumés.in the instrument cluster are illuminated.

The ATTENTION ASSIST system is deactivated.

WARNING

The braking system continues to operate with its normal efficiency, but without the functions listed above. The wheels may lock, for example during full braking.

The vehicle's handling during braking is then limited and the braking distance may be longer.

If ESP® is deactivated or not operational, vehicle stability is reduced during standard manoeuvres.

There is a risk of an accident.

  • Continue driving carefully.
  • Go to a qualified workshop immediately.
cf. notice d'utilisationNot available at the moment
see Operator's Manual		 ESP®, BAS, PRE-SAFE® system, HOLD function, Hill Start Assist and trailer stabilization with ESP® are not available at the moment.

Adaptive brake lights and Adaptive Brake Assist may also be malfunctioning.

In addition, the warning lampsqui se trouvent sur le combinéand
d'instruments sont allumés.in the instrument cluster are illuminated.

The ATTENTION ASSIST system is deactivated.

The self-diagnosis is not yet complete, for example.

WARNING

The braking system continues to operate with its normal efficiency, but without the functions listed above.

If ESP® is deactivated or not operational, vehicle stability is reduced during standard manoeuvres.

There is a risk of an accident.

  • Drive a short, slightly winding route at more than 20 km/h, driving carefully.

If the message disappears, the functions listed above are available again.

If the message remains displayed:

  • Continue driving carefully.
  • Visit a qualified workshop.
d'utilisationNot working, see
Operator's Manual		 ESP®, BAS, PRE-SAFE® system, HOLD function, hill start assist and trailer stabilisation with ESP® are not available due to a fault.

Adaptive brake lights and Adaptive Brake Assist may also be malfunctioning.

In addition, the warning lampsqui se trouvent sur le combinéand
d'instruments sont allumés.in the instrument cluster are illuminated.

The ATTENTION ASSIST system is deactivated.

WARNING

The braking system continues to operate with its normal efficiency, but without the functions listed above.

If ESP® is deactivated or not operational, vehicle stability is reduced during standard manoeuvres.

There is a risk of an accident.

  • Continue driving carefully.
  • Visit a qualified workshop.
not working, see

Owner's Manual

 EBD (Electronic Brake-force Distribution), ABS, ESP®, BAS, PRE-SAFE® system, HOLD function, hill start assist and trailer stabilisation with ESP® are not available due to a fault.

Adaptive brake lights and Adaptive Brake Assist may also be malfunctioning.

In addition, the warning lampset,
qui se trouvent sur le combinéand
d'instruments sont allumés et un signal d'alerte retentit.The warning lamps on the instrument cluster
light up and a warning tone sounds.

The ATTENTION ASSIST system is deactivated.

WARNING

The braking system continues to operate with its normal efficiency, but without the functions listed above. The wheels may lock, for example during full braking.

The vehicle's handling during braking is then limited and the braking distance may be longer.

If ESP® is deactivated or not operational, vehicle stability is reduced during standard manoeuvres.

There is a risk of an accident.

  • Continue driving carefully.
  • Go to a qualified workshop immediately.
Le voyant rouge clignoteRelease parking brakeThe red indicatoret un signal d'alerte retentit. Une des conditions pour le desserrage automatiqueflashes
and a warning tone sounds. One of the conditions for automatic release of the electric parking brake is not met.

You are driving with the electric parking brake applied.

  • Release the electric parking brake manually.

The red indicatoret un signal d'alerte retentit.flashes
and a warning tone sounds.

You are performing emergency braking using the electric parking brake.
notice d'utilisationParking brake, see
Owner's Manual		 The orange warning lampLe frein de stationnement électrique est en panne.lights up.

The electric parking brake is faulty.

To apply it:

  • Switch off the ignition.
  • Press and hold the electric parking brake switch for at least 10 seconds.
  • Vehicles with manual transmission: engage 1st gear.
  • Vehicles with automatic transmission: shift to P.

Contact a qualified workshop.

The orange warning lamps'allument.and the red warning lamp
Le frein de stationnement électrique est en panne.light up.


The electric parking brake is faulty.

To release it:

  • Switch the ignition off, then back on.
  • Release the electric parking brake manually.
  • Vehicles with manual transmission: release the electric parking brake using the emergency automatic release function.
  • Vehicles with automatic transmission: release the electric parking brake using the automatic release function.

If the orange warning lampstays on or flashes:


  • Do not continue driving.
  • Contact a qualified workshop.

The red indicatoret le voyant orange d'alerteflashes
and the orange warning lampLe frein de stationnement électrique est en panne.lights up.


The electric parking brake is faulty.

To release it:

  • Switch the ignition off, then back on.
  • Release the electric parking brake manually.

To apply it:

  • Switch the ignition off, then back on.
  • Apply the electric parking brake manually.

If the red warning lampde clignoter :continues
to flash:

  • Do not continue driving.
  • Secure the vehicle so that it cannot roll away.
  • Vehicles with manual transmission: engage 1st gear.
  • Vehicles with automatic transmission: shift to P.
  • Turn the front wheels towards the kerb.
  • Contact a qualified workshop.

The orange warning lampclignote pendant 10 secondeslights up. The red warning lamp
environ après le serrage ou le desserrage du frein de stationnement électrique.flashes for approx. 10 seconds
after applying or releasing the electric parking brake. It then goes out or stays on.

The electric parking brake is faulty.

  • Switch the ignition off, then back on.
  • Apply the electric parking brake.

If you cannot apply the electric parking brake:

  • Vehicles with manual transmission: engage 1st gear.
  • Vehicles with automatic transmission: shift to P.
  • Visit a qualified workshop.

If you cannot release the electric parking brake:

  • Vehicles with manual transmission: release the electric parking brake using the emergency automatic release function.
  • Vehicles with automatic transmission: release the electric parking brake using the automatic release function.

If the electric parking brake still cannot be released:

  • Contact a qualified workshop.

The orange warning lamp . When applying or releasing the electric parking brake manually, the red warning lampLe frein de stationnement électrique est en panne. Vous ne pouvez pasflashes.


The electric parking brake is faulty. You cannot apply the electric parking brake manually.

  • Vehicles with manual transmission: switch off the ignition.

The electric parking brake is applied automatically.

You can release the electric parking brake using the emergency automatic release function.

  • Vehicles with automatic transmission: shift to P, as the electric parking brake is not applied automatically.
  • Visit a qualified workshop.
If the electric parking brake does not need to be applied, do not switch off the ignition, for example if the vehicle has to be towed or driven through an automatic car wash. Exception: towing with the front axle raised.
pasParking brake inop.
The orange warning lampclignote pendant 10 secondeslights up. The red warning lamp
environ après le serrage ou le desserrage du frein de stationnement électrique.flashes for approx. 10 seconds
after applying or releasing the electric parking brake. It then goes out or stays on.

The electric parking brake is faulty, for example due to overvoltage or undervoltage.

  • Remove the cause of the overvoltage or undervoltage, for example by charging the battery or restarting the engine.
  • Apply or release the electric parking brake.

If the electric parking brake still cannot be applied or released:

  • Switch the ignition off, then back on.
  • Apply or release the electric parking brake.

If the electric parking brake still cannot be released:

  • Contact a qualified workshop.

This message only appears while driving. The orange warning lampclignote.lights up and the red warning lamp
Vous ne pouvez pas serrer manuellement le frein de stationnement électrique.flashes.


You cannot apply the electric parking brake manually.

  • Vehicles with manual transmission: engage 1st gear.
  • Vehicles with automatic transmission: shift to P.
  • Visit a qualified workshop.
le desserrer: mettre le contactParking brake To
release it: switch on the ignition		 The red indicatorVous avez essayé de desserrer le frein de stationnement électrique alorslights up.


You tried to release the electric parking brake while the ignition was not switched on.

  • Turn the key to position 1 in the ignition switch.
de freinCheck brake fluid
level		 There is not enough brake fluid in the reservoir.

In addition, the red warning lampd'instruments est allumé et un signal d'alerte retentit.The red warning lamp
on the instrument cluster lights up and a warning tone sounds.

WARNING

Braking efficiency may be reduced.

There is a risk of an accident.

  • Stop immediately, taking traffic conditions into account.

Do not continue driving!

  • Apply the electric parking brake.
  • Do not top up the brake fluid. This will not rectify the fault.
  • Contact a qualified workshop.
Les garnitures de frein ont atteint la limite d'usure.Brake pads wornThe brake pads have reached the wear limit.
  • Visit a qualified workshop.
PRE-SAFE not working, see Owner's Manual Some important functions of the PRE-SAFE® system have failed. All other occupant protection systems, such as the airbags, remain available.
  • Go to a qualified workshop immediately.
PRE-SAFE temporarily limited operation, see Owner's Manual Adaptive Emergency Brake Assist is temporarily not operational.

Possible causes:

  • The radar sensor cover in the radiator grille is dirty.
  • Its operation is impaired by heavy precipitation.
  • The sensors in the bumpers are dirty.
  • The radar sensor system is temporarily not operational, for example due to electromagnetic radiation near radio and TV transmitters or other sources of radiation.
  • The system temperature is not within the operating temperature range.
  • The vehicle electrical system voltage is too low.

If the message does not disappear:

  • Stop the vehicle, taking traffic conditions into account.
  • Apply the electric parking brake.

    Clean the radar sensor system in the radiator grille.

  • Clean the bumpers.
  • Restart the engine.

When the system detects that the sensors are fully available, the message disappears.

Adaptive Brake Assist may work again.
PRE-SAFE Limited function, see owner's manual Adaptive Brake Assist is faulty. Distance Alert may also be out of order.
  • Visit a qualified workshop.
L'affichage du symbole sur le visuel multifonction vous indique queThe symbol displayed on the multifunction display indicates that a rear seat belt is fastened.

For more information on the rear seat belt status indicator, see
L'affichage du symbole sur le visuel multifonction vous indique queThe symbol displayed on the multifunction display indicates that a rear seat belt is not fastened.

WARNING

A seat belt that is incorrectly positioned or not properly fastened cannot provide the intended protective function.

The risk of injury increases.

  • If necessary, ask the rear passengers to fasten their seat belts.

For more information on the rear seat belt status indicator, see
Aller à l'atelierRestraint system fault
Go to workshop		 The supplemental restraint systems (SRS) are faulty. In addition, the warning lamptrouve sur le combiné d'instruments est allumé.ATTENTIONin the instrument cluster is illuminated.

WARNING

The airbags and belt tensioners may trigger unintentionally or may not trigger in an accident.

The risk of injury increases.

Visit a qualified workshop.

For more information on occupant safety, see
à l'atelier ou avant droit Défaut Aller à l'atelierFront left fault Go to
workshop or Front right fault Go to workshop		 The front left or right supplemental restraint systems (SRS) are faulty. In addition, the warning lampd'instruments est allumé.ATTENTIONin the instrument cluster
is illuminated.

WARNING

The airbags and belt tensioners may trigger unintentionally or may not trigger in an accident.

The risk of injury increases.

Visit a qualified workshop.
Aller à l'atelier ou arrière droit Défaut Aller à l'atelierRear left fault
Go to workshop or Rear right fault Go to workshop		 The supplemental restraint systems (SRS) at the rear left or right seating position are faulty. In addition, the warning lamp in the instrument cluster is illuminated.

WARNING

The airbags and belt tensioners may trigger unintentionally or may not trigger in an accident.

The risk of injury increases.

  • Visit a qualified workshop.
Aller à l'atelierRear center fault
Go to workshop		 The supplemental restraint systems (SRS) at the rear center seating position are faulty. In addition, the warning lampd'instruments est allumé.ATTENTIONin the instrument cluster
is illuminated.

WARNING

The airbags and belt tensioners may trigger unintentionally or may not trigger in an accident.

The risk of injury increases.

Visit a qualified workshop.
Aller à l'atelier ou Airbag rideau droit Défaut Aller à l'atelierLeft curtain airbag fault
Go to workshop or Right curtain airbag fault Go to workshop		 The left or right curtain airbag is faulty. In addition, the warning lampd'instruments est allumé.ATTENTIONin the instrument cluster
is illuminated.

WARNING

The left or right curtain airbag may trigger unintentionally or may not trigger in an accident.

The risk of injury increases.

Visit a qualified workshop.

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A quick Mercedes-Benz B-Class quiz: every answer comes with an explanation and a link to the manual page.