Test Y: Trailer Lamps Are Inoperative

PINPOINT TEST Y: THE TRAILER LAMPS ARE INOPERATIVE

Y1-Y2:

Y2-Y4:

Y4-Y5:

Y5-Y6:

Normal Operation
Voltage to the trailer tow lamps is controlled by the smart junction box (SJB). Circuits 52 (YE) and 64 (DG) supply voltage to the trailer tow LH and RH stop/turn lamps respectively. Circuit 962 (BN/WH) supplies voltage to the trailer tow parking lamps. Ground for the trailer lamps is provided on circuit 57 (BK).

Possible Causes
- circuit 52 (YE) open, or short to ground
- circuit 57 (BK) open
- circuit 64 (DG) open, or short to ground
- circuit 962 (BN/WH) open
- trailer
- SJB