DTC B1407-87: Trailer Module - missing message: Action
- Refer to applicable SYSTEM WIRING DIAGRAM(S) and check the LIN circuit between the auxiliary trailer socket and rear junction box for open circuit, high resistance. Repair wiring harness as required. Clear DTC and retest
- Refer to applicable SYSTEM WIRING DIAGRAM(S) and check the auxiliary trailer socket power circuit for open circuit, high resistance. Repair wiring harness as required. Clear DTC and retest
- If no wiring faults are present, check and install new auxiliary trailer socket as required. Clear DTC and retest
- If problem persists, check and install new rear junction box as required. Clear DTC and retest