Trailer Hitch

Fault code 2231

Brake signal actuated (PSM)

Diagnostic conditions
- Ignition on
- Trailer hitch control module, internal function test

Possible causes of fault
- No communication possible via CAN comfort
- Trailer hitch control module faulty

Affected pins
Trailer hitch control module, plug B:
- Pin 8 'CAN comfort (low)'
- Pin 7 'CAN comfort (high)'

Diagnosis/troubleshooting

NOTE: See also 'Fault code 0256' for the brake light switch, as both faults are monitored redundantly together.