Symptom |
Possible causes |
Action |
Trailer brake lamp(s) inoperative |
- Bulb failure
- Fuse(s) blown
- Circuit fault
- Brake lamp switch fault
|
Check the bulb and fuse condition (see visual inspection).
Check the trailer brake lamp circuit. Check the brake lamp switch
function. Refer to the electrical guides. |
Trailer brake lamp(s) dim |
- Incorrect bulb rating
- Circuit fault
- Brake lamp switch fault
|
Check the bulb condition and rating. Check the trailer brake
lamp circuit. Check the brake lamp switch function. Refer to the
electrical guides. |
Trailer brake lamp(s) stuck on |
- Circuit fault
- Brake lamp switch fault
|
Check the trailer brake lamp circuits. Check the brake lamp
switch function. Refer to the electrical guides. |
Trailer fog lamp(s) inoperative |
- Bulb failure
- Fuse(s) blown
- Circuit fault
|
Check the bulb and fuse condition (see visual inspection).
Check the trailer fog lamp circuit. Refer to the electrical guides. |
Trailer fog lamp(s) dim |
- Incorrect bulb rating
- Circuit fault
|
Check the bulb condition and rating. Check the trailer fog
lamp circuit. Refer to the electrical guides. |
Trailer fog lamp(s) stuck on |
|
Check the trailer fog lamp circuit. Refer to the electrical
guides. |
Trailer tail and number plate lamp(s) inoperative |
- Bulb failure
- Fuse(s) blown
- Circuit fault
- Trailer side lamp relay fault
|
Check the bulb and fuse condition (see visual inspection).
Check the trailer tail and number plate lamp circuit. Check the trailer
tail and number plate lamp relay function. Refer to the electrical guides.
|
Trailer tail and number plate lamp(s) dim |
- Incorrect bulb rating
- Circuit fault
- Trailer side lamp relay fault
|
Check the bulb condition and rating. Check the trailer tail
and number plate lamp circuit. Check the trailer side lamp relay function.
Refer to the electrical guides. |
Trailer tail and number plate lamp(s) stuck on |
- Circuit fault
- Trailer tail and number plate lamp relay fault
|
Check the trailer tail and number plate lamp circuit. Check
the trailer tail and number plate lamp relay function. Refer to the
electrical guides. |
Trailer turn signal lamp(s) inoperative |
- Bulb failure
- Fuse(s) blown
- Circuit fault
|
Check the bulb and fuse condition (see visual inspection).
Check the trailer turn signal lamp circuit. Refer to the electrical
guides. |
Trailer turn signal lamp(s) dim |
- Incorrect bulb rating
- Circuit fault
|
Check the bulb condition and rating. Check the trailer turn
signal lamp circuits. Refer to the electrical guides. |
Trailer turn signal lamp(s) stuck on |
|
Check the bulb and fuse condition (see visual inspection).
Check the trailer turn signal lamp circuit. Refer to the electrical
guides. |
Trailer reverse lamp(s) inoperative |
- Bulb failure
- Fuse(s) blown
- Circuit fault
- Trailer reverse lamp relay fault
|
Check the bulb and fuse condition (see visual inspection).
Check the trailer reverse lamp circuit. Check the trailer reverse lamp
relay function. Refer to the electrical guides. |
Trailer reverse lamp(s) dim |
- Circuit fault
- Trailer reverse lamp relay fault
|
Check the bulb condition and rating. Check the trailer
reverse lamp circuit. Check the trailer reverse lamp relay function. Refer
to the electrical guides. |
Trailer reverse lamp(s) stuck on |
- Circuit fault
- Trailer reverse lamp relay fault
|
Check the trailer reverse lamp circuit. Check the trailer
reverse lamp relay function. Refer to the electrical guides. |
Warning lamp(s) inoperative |
- Fuse(s) blown
- Circuit fault
- Instrument cluster fault
|
Check the fuse(s) (see visual inspection). Check the warning
lamp circuit. Refer to the electrical guides. Check for DTCs indicating an
instrument cluster or CAN system fault. |
Trailer socket battery feed missing |
- Fuse(s) blown
- Circuit fault
|
Check the fuse condition (see visual inspection). Check the
trailer battery feed circuit. Refer to the electrical guides. |
Trailer socket ignition feed missing |
- Fuse(s) blown
- Circuit fault
- Trailer socket relay faulty
|
Check the fuse condition (see visual inspection). Check the
trailer ignition feed circuit. Check the trailer ignition feed relay
operation. Refer to the electrical guides. |