Drivers Information

General
For Brake Assist (BAS) a system malfunction indicator lamp is located in the instrument cluster.
On vehicles with Electronic Traction System (ETS), Automatic Slip Regulation (ASR) or Electronic Stability Program (ESP) this is combined with the Malfunction Indicator Lamp (MIL) of the respective traction system.


Switching On Ignition And Starting Engine
When the ignition is switched on (ignition starter switch position "2") the malfunction indicator lamp in the instrument cluster lights up (bulb check) and goes out again once the engine is running.
If the BAS malfunction indicator lights up while the engine is running, there is a malfunction in the BAS. The system is deactivated, but the brake system with ABS remains fully effective. In the case of the combined malfunction indicator lamp (BAS/ETS, BAS/ASR, BAS/ESP), the fault may be in either the BAS or the traction system. If the former, ETS, ASR or ESP remains in operation. if the latter, BAS remains in operation.

NOTE: In the case of vehicles with BAS integrated into the ESP, ESP is also deactivated if there is a fault in the BAS.

Driving
System faults occurring while the vehicle is being driven also cause the BAS malfunction indicator lamp to light up constantly. If the BAS malfunction indicator lamp comes on while driving and goes out again after a time, the cause is insufficient battery voltage.