Test C: The Headlamps Are On Continuously

PINPOINT TEST C: THE HEADLAMPS ARE ON CONTINUOUSLY

C1-C8:

C9-C14:

Normal Operation
The smart junction box (SJB) monitors the headlamp switch position. When the headlamp switch is in the HEADLAMPS ON position, the SJB supplies voltage to the RH and LH headlamps through circuits 1336 (LG/WH) and 1338 (WH), respectively. The SJB controls the ground circuit for the high beam relay coil (which is supplied battery voltage) through circuit 1708 (LG/BK). When the high beam relay is energized, power is routed to circuit 1337 (VT/YE) from the bussed electrical center (BEC). If a problem is detected with any of the signal circuits to the headlamp switch, the SJB will default the parking lamps and headlamps on.

Possible Causes
- Circuit 1336 (LG/WH) short to voltage
- Circuit 1337 (VT/YE) short to voltage
- Circuit 1338 (WH) short to voltage
- Circuit 1395 (RD/PK) short to ground
- Circuit 1708 (LG/BK) short to ground
- High beam relay
- BEC
- SJB