Inspection and Verification

Inspection and Verification

1. Verify the customer concern.
2. Visually inspect for obvious electrical faults.

Mechanical Electrical
^ Trailer lamp (s) ^ Fuses Battery junction box (BJB) - link
condition and fitment 18E BJB - link 11E Central junction box (CJB) - Fuse 22P (CJB) - Fuse 8P (CJB) - Fuse 6P (CJB) - Fuse 32P (CJB) - Fuse 14P Trailer fuse box - Fuse to trailer socket relay Trailer fuse box - Fuse to trailer socket battery feed Trailer fuse box - Fuse to trailer socket brake lamp Trailer fuse box - Fuse to trailer socket fog lamps Trailer fuse box - Fuse to trailer socket right hand tail lamp Trailer fuse box - Fuse to trailer socket number plate and left hand tail lamps
^ Bulbs and fitment ^ Relays Reverse lamp relay Side lamp relay trailer socket relay
^ Bulb holders and fitment ^ Stop lamp switch
^ Trailer socket(s), ^ Wiring harness
plug(s) and fitment
^ Loose or corroded connector(s)
^ Trailer socket(s) ground circuit(s)
^ Battery junction box (BJB)
^ Central junction box (CJB)
^ Trailer fuse box
^ Trailer relay box
^ Instrument panel cluster (IPC)
^ Controller area network (CAN) circuits

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.
^ Because the DTCs are stored in more than one module, a complete vehicle read is recommended
^ Make sure that all DTCs are cleared the rectification