Vehicle Electrical System (BNSG)

Fault code 1517

Trailer hitch control module

Diagnostic conditions
- Ignition on
- Internal control module function test
- Trailer connected

Possible causes of fault
- To localise the fault, read out the fault memory for the 'AHK control module' (Please read out fault memory)
- 'No signal/communication' No message from AHK control module on CAN comfort.
- 'AHK control module faulty'.

Affected pins
Plug 'A' on vehicle electrical system control module:
- Pin 1 'CAN comfort (high)'
- Pin 2 'CAN comfort (low)'

Diagnosis/troubleshooting

NOTE: If there is no incoming signal/message via CAN comfort using several control modules, CAN comfort must be checked for open or short circuits. Refer to 'Checking instructions/CAN data bus'.