P0571

P0571

Diagnosis information - DME (DFI)

Brake light switch

NOTE:
- The PSM control unit only reads in the switch states.
- Evaluation and diagnosis are performed in the DME (DFI) control unit.
- Diagnosis checks the unambiguity of the states which are output via the brake light switch.
- This fault is set if the state [brake actuated] or [brake not actuated] is not unambiguously detected.

Diagnostic conditions
- Ignition on
- Battery positive voltage between 10 V and 16 V

Possible fault causes
- Short circuit to B+/ground/between wires or open circuit in the wiring
- Brake light switch loose or installed at an angle
- Holder bent
- Brake light switch faulty