Possible cause of fault
- Short circuit to ground/B+ or open circuit
- Plug connection on stop light switch faulty
- Incorrect adjustment of the stop light switch
- Wiring/plug connection between pressure sensor and control module faulty
- Pressure sensor faulty
NOTE:
A malfunction of the stop light switch can cause this fault. The stop light switch must have switched before a brake pressure is recognized. When the brake pedal is actuated, the stop light switch and the brake lights are triggered. The brake pressure on the pressure sensor is 0 bar.