Test W: The Trailer Lamps Are Inoperative
PINPOINT TEST W: THE TRAILER LAMPS ARE INOPERATIVEW1-W3:
W3-W5:
W6-W8:
W8-W11:
W11-W12:
Normal Operation
The trailer tow relays are supplied voltage from the bussed electrical center (BEC). Ground for the trailer tow parking lamp relay coil is provided through circuit 576 (DG). Ground for the trailer tow LH turn lamp relay coil is provided through circuit 374 (DB/WH). Ground for the trailer tow RH turn lamp relay coil is provided through circuit 378 (BN/YE). Ground for the trailer tow relay coils is controlled by the smart junction box (SJB). When the trailer tow parking lamp relay is energized, voltage is routed from the BEC to the trailer tow connector through circuit 962 (BN/WH). When the trailer tow LH turn lamp relay is energized, voltage is routed from the BEC to the trailer tow connector through circuit 52 (YE). When the trailer tow RH turn lamp relay is energized, voltage is routed from the BEC to the trailer tow connector through circuit 64 (DG). Ground is supplied to the trailer through circuit 206 (WH).
Possible Causes
- Fuse
- Circuit 52 (YE) open
- Circuit 64 (DG) open
- Circuit 206 (WH) open
- Circuit 374 (DB/WH) open or short to voltage
- Circuit 378 (BN/YE) open or short to voltage
- Circuit 576 (DG) open or short to voltage
- Circuit 962 (BN/WH) open
- Trailer tow parking lamp relay
- Trailer tow LH turn relay
- Trailer tow RH turn relay
- Trailer
- BEC
- SJB