Parkassist

Fault code 1517

Trailer hitch control unit

NOTE: With this fault, the rear ParkAssist sensor system is activated even with a trailer.

Diagnostic conditions
- Ignition on
- ParkAssist control unit internal function test

Possible cause of fault
- No signal/communication (no signal from trailer hitch control unit on CAN comfort)

Affected pins
Plug A for ParkAssist control unit:
- Pin 3 'CAN comfort (low)'
- Pin 2 'CAN comfort (high)'

Diagnosis/troubleshooting