Mercedes-Benz GLA 250 2019 Operator's Manual page 212

Display messages
210
Display messages
Active Brake Active Brake
Assist Functions Assist Functions
Currently Limited Currently Limited
See Operator's Man‐ See Operator's Man‐
ual ual
Active Brake Active Brake
Assist: System Assist: System
Inoperative Inoperative
Radar Sensors Radar Sensors
Dirty See Opera‐ Dirty See Opera‐
tor's Manual tor's Manual
Possible causes/consequences and M M Solutions
Active Brake Assist is temporarily inoperative.
Possible causes are:
the radar sensor system is temporarily inoperative, e.g. due to
R
electromagnetic radiation emitted by nearby TV or radio stations
or other sources of electromagnetic radiation
the system is outside the operating temperature range
R
the on-board voltage is too low
R
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:
Pull over and stop the vehicle safely as soon as possible, paying
X
attention to road and traffic conditions.
Secure the vehicle against rolling away (
X
Restart the engine.
X
Active Brake Assist is unavailable due to a malfunction. Situation-
dependent braking assistance may also have failed.
Visit a qualified specialist workshop immediately.
X
The radar sensor system is malfunctioning.
Possible causes are:
dirt on sensors
R
heavy rain or snow
R
when driving on inter-urban roads without traffic or infrastructure,
R
e.g. in desert-like areas
At least one driving system or driving safety system is malfunction-
ing or is temporarily unavailable:
Active Brake Assist
R
Active Distance Assist DISTRONIC
R
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
disappears.
If the display message does not disappear:
Pull over and stop the vehicle safely as soon as possible, paying
X
attention to road and traffic conditions.
Secure the vehicle against rolling away (
X
Switch off the engine.
X
Clean all sensors (
X
Y
Restart the engine.
X
The display message disappears.
page 145).
Y
page 145).
Y
page 282).