Mercedes Benz A-Class - ABS/ESP warning light lights up | HELLA
Mercedes Benz A-Class
Type: 168
All models
ABS/ESP warning light lights up
Error code C1201/ C1202
Error in braking assistant (BAS) trip switch; signal implausible
If the problem mentioned above is detected, this may be caused by the BAS trip switch.
A signal evaluation error leads to the entering of an error in the control unit.
As it is not possible to take measurements from the switch itself, start by checking the peripheral equipment of the ABS system. If the fault cannot be traced back to any other cause, the switch must be replaced.
Repair note
The trip switch is built into the brake booster and cannot be replaced separately.
As such, the entire unit must be replaced if damaged.
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