Test D: One Low Beam Headlamp Is Inoperative - High Intensity Discharge (HID) Headlamps

PINPOINT TEST D: ONE LOW BEAM HEADLAMP IS INOPERATIVE - HIGH INTENSITY DISCHARGE (HID) HEADLAMPS

Normal Operation
When the smart junction box (SJB) receives a request for the low beams, the SJB provides voltage to circuits 1338 (WH) and 1336 (LG/WH), through the bussed electrical center (BEC), to the LH and RH high intensity discharge (HID) relays, respectively. Ground for the HID relays is provided through circuit 1205 (BK), which is routed through the BEC.

Voltage is supplied to the LH and RH HID relay switches through circuits 1055 (WH/LG) and 1056 (DB/LG), respectively.

When the HID relays are energized, voltage is routed to the LH and RH headlamps through circuits 2008 (PK/WH) (PK/BK for 5.4L) and 2009 (PK/WH), respectively.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- HID relay
- BEC
- Ballast
- HID bulb
- Headlamp assembly
- SJB

D1-D3:

D3-D5:

D5-D6:

D6-D8:

D8-D9:

D9-D10:

D10-D11:

D11-D12:

D13-D14:

D14-D15:

D15-D18:

D19: