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Display messages
Possible causes/consequences and MM Solutions
ActiveActive BrakeBrake AssistAssist
FunctionsFunctions CurrentlyCurrently
Limited See Opera‐Limited See Opera‐
tor's Manualtor's Manual
Active Brake Assist is temporarily inoperative.
Possible causes are:
R
the radar sensor system is temporarily inoperative, e.g. due to elec-
tromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation
R
the system is outside the operating temperature range
R
the on-board voltage is too low
When the causes stated above no longer apply, the display message
disappears.
Active Brake Assist is operational again.
If the display message does not disappear:
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X
Secure the vehicle against rolling away (Y page 142).
X
Restart the engine.
Active BrakeActive Brake
Assist:Assist: SystemSystem Inop‐Inop‐
erativeerative
Active Brake Assist is unavailable due to a malfunction. Situation-
dependent braking assistance may also have failed.
X
Visit a qualified specialist workshop immediately.
RadarRadar SensorsSensors DirtyDirty
See Operator's Man‐See Operator's Man‐
ualual
The radar sensor system is malfunctioning.
Possible causes are:
R
dirt on sensors
R
heavy rain or snow
R
when driving on inter-urban roads without traffic or infrastructure,
e.g. in desert-like areas
At least one driving system or driving safety system is malfunctioning
or is temporarily unavailable:
R
Active Brake Assist
R
Active Distance Assist DISTRONIC
A warning tone also sounds.
Once the cause of the problem is no longer present, the driving and
drive safety systems will be available again. The display message dis-
appears.
If the display message does not disappear:
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X
Secure the vehicle against rolling away (Y page 142).
X
Switch off the engine.
X
Clean all sensors (Y page 269).
X
Restart the engine.
The display message disappears.
200
Display messages
On-board computer and displays
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