Test B: The High Beams Are Inoperative

PINPOINT TEST B: THE HIGH BEAMS ARE INOPERATIVE

B1-B4:

B4-B5:

B5-B6:

B6-B7:

B7-B9:

B9-B12:

B12-B13:

Normal Operation
When the headlamp switch is placed in the HEADLAMPS ON position, the smart junction box (SJB) monitors the multifunction switch by sending a voltage reference signal through circuit 1394 (WH/RD). When the multifunction switch is placed in the HIGH BEAM position, the signal is routed to an internal ground within the SJB through circuit 1396 (VT/WH). The SJB then supplies ground for the high beam relay coil through circuit 1708 (LG/BK). The high beam relay is supplied voltage at all times from the bussed electrical center (BEC). When the high beam relay is energized, voltage is routed to the high beams.

Possible Causes
- Fuse
- Circuit 1394 (WH/RD) open
- Circuit 1396 (VT/WH) open
- Circuit 1708 (LG/BK) open or short to voltage
- High beam relay
- Multifunction switch
- BEC
- SJB