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

Driver assistance 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
~7min read

Displaying messages Possible causes/consequences and solutions
une pauseAttention Assist: Take
a break		 Based on certain criteria, the ATTENTION ASSIST system has detected signs of fatigue or increasing driver inattentiveness. In addition, a warning tone sounds.
  • Take a break if necessary.

On long journeys, take regular breaks in time to rest.
pasAttention Assist is not
working		 The ATTENTION ASSIST system is faulty.
  • Visit a qualified workshop.
Speed limit reminder not available.

for the moment, see operator's manual

 The speed limit reminder is deactivated and temporarily not operational. Possible causes:
  • The windshield is dirty in the camera's field of view.
  • Visibility is impaired by heavy precipitation or fog.
  • Clean the windshield.

When the system detects that the camera is fully available, the message disappears.

The speed limit reminder can operate again.
Speed limit reminder: not available in this country The speed limit reminder is only available in certain countries.
  • Continue driving.

As soon as you drive in a country where approval exists, the speed limit reminder is available again.
Speed limit reminder not working The speed limit reminder is faulty.
  • Visit a qualified workshop.
La fonction HOLD est désactivée. Le véhicule a dérapé.En outre, undeactivatedThe HOLD function is deactivated. The vehicle has skidded.

In addition, a warning tone sounds.

  • Reactivate the HOLD function later
Radar sensors deactivated, see operator's manual The radar sensors are deactivated.
  • Check whether the radar sensors can be reactivated.
  • Activate radar sensors
Radar sensors deactivated automatically, see operator's manual Vehicles with navigation system: the vehicle is near a radio astronomy facility and therefore cannot emit radar signals.

The radar sensors have deactivated automatically.

If Blind Spot Assist is activated, it is automatically deactivated. In addition, theintégrés aux rétroviseurs extérieurs sont allumés.orange
indicator lamps integrated in the exterior mirrors are illuminated.

  • Continue driving.

Blind Spot Assist is available again as soon as the vehicle is far enough away from the radio astronomy station.

Vehicles equipped with the Becker® MAP PILOT system: if the Becker® MAP PILOT system is not connected, the radar sensor system is automatically deactivated.

Blind Spot Assist is not available.

  • Connect the Becker® MAP PILOT system (see the separate operator's manual).
Lane Keeping Assist not available at present, see operator's manual Lane Keeping Assist is deactivated and temporarily not operational. Possible causes:
  • The windshield is dirty in the camera's field of view.
  • Visibility is impaired by heavy precipitation or fog.
  • The lane markings are missing for a period of time.
  • The lane markings are worn, dark or covered with dirt or snow, for example.

If the message does not disappear:

  • Stop the vehicle, taking traffic conditions into account.
  • Secure the vehicle so that it cannot roll away.
  • Clean the windshield.

When the system detects that the camera is fully available, the message disappears.

Lane Keeping Assist or Active Lane Keeping Assist may be operational again.
Lane Keeping Assist not working Lane Keeping Assist is defective.
  • Visit a qualified workshop.
Blind Spot Assist not available at present, see operator's manual Blind Spot Assist is temporarily not operational. Possible causes:
  • The electrical connection between the trailer and the vehicle is established.
  • The sensors are dirty.
  • Its operation is impaired by heavy precipitation.
  • The temperature of the radar sensor system is not within the operating temperature range.
  • The radar sensor system is temporarily not operational, for example due to electromagnetic radiation near radio and TV transmitters or other sources of radiation.

In addition, the orangesont allumés.indicator lamps integrated in the exterior mirrors
are illuminated.

  • If you are towing a trailer, confirm the message with.

If you are driving without a trailer and the message does not disappear:

  • Stop the vehicle, taking traffic conditions into account.
  • Secure the vehicle so that it cannot roll away.
  • Clean the sensors.
  • Restart the engine.

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

Blind Spot Assist may be operational again.
Blind Spot Assist not working Blind Spot Assist is defective.

In addition, the orangeintégrés aux rétroviseurs extérieurs sont allumés.
indicator lamps integrated in the exterior mirrors are illuminated.

  • Visit a qualified workshop.
Parking Assist interrupted The driver's seat belt is not fastened and the driver's door is open.
  • Repeat the maneuver once the seat belt is fastened and the driver's door is closed.

You unintentionally touched the multifunction steering wheel during active steering.

  • Make sure not to touch the multifunction steering wheel during active steering.

ESP® intervened because the vehicle skidded.

  • Reactivate active parking assist later
Parking Assist not working You have just carried out numerous maneuvers.

You can reactivate active parking assist after approx. 10 minutes.

  • Stop the vehicle, taking traffic conditions into account.
  • Switch off the engine and restart it.

If the message remains displayed:

  • Visit a qualified workshop.

PARKTRONIC is defective.

  • Visit a qualified workshop.
DISTRONIC PLUS deactivated DISTRONIC PLUS has been deactivated. In addition, a warning signal sounds when automatic deactivation occurs.
DISTRONIC PLUS available again After a temporary unavailability, DISTRONIC PLUS may be operational again. You can activate DISTRONIC PLUS again.
DISTRONIC PLUS not available at present, see operator's manual DISTRONIC PLUS is deactivated and temporarily not operational.

Possible causes:

  • The DISTRONIC PLUS cover in the radiator grille is dirty.
  • Its operation is impaired by heavy precipitation.
  • 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.

In addition, a warning tone sounds.

If the message does not disappear:

  • Stop the vehicle, taking traffic conditions into account.
  • Secure the vehicle so that it cannot roll away.
  • Clean the DISTRONIC PLUS cover in the radiator grille.
  • Restart the engine.

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

DISTRONIC PLUS may be operational again.
DISTRONIC PLUS not working DISTRONIC PLUS is defective. Adaptive Brake Assist may also be malfunctioning.

In addition, a warning tone sounds.

  • Visit a qualified workshop.
DISTRONIC PLUS inactive You have accelerated. DISTRONIC PLUS no longer intervenes.
  • Take your foot off the accelerator pedal.
DISTRONIC PLUS --- km/h One of the activation conditions for DISTRONIC PLUS is not met.
  • Check the activation conditions for DISTRONIC PLUS
DISTRONIC PLUS and SPEEDTRONIC not working DISTRONIC PLUS and SPEEDTRONIC are defective. In addition, a warning signal sounds.
  • Visit a qualified workshop.
CRUISE CONTROL and SPEEDTRONIC not working CRUISE CONTROL and SPEEDTRONIC are defective.

In addition, a warning tone sounds.

  • Visit a qualified workshop.
Limit --- km/h SPEEDTRONIC cannot be activated when you press the accelerator pedal beyond the pressure point (kickdown).
CRUISE CONTROL --- km/h One of the activation conditions for CRUISE CONTROL is not met.

For example, you tried to store a speed lower than 30 km/h.

  • If the situation allows, drive faster than 30 km/h and store the speed.
  • Check the activation conditions for CRUISE CONTROL
120 km/h Maximum speed exceeded Only for certain countries: you have exceeded the maximum permitted speed.

In addition, the message 120 km/h! appears in the multifunction display.

  • Drive more slowly.

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