Courtesy Lamp Inoperative From All Doors

SYMPTOM
* COURTESY LAMP INOPERATIVE FROM ALL DOORS

POSSIBLE CAUSES
- No response(BCM)/CCD bus failure
- Fused B(+) circuit open
- Courtesy lamp driver circuit open
- Courtesy lamp relay control circuit open
- Courtesy lamps ground circuit open
- Courtesy light relay defective ( open)
- BCM defective (relay control function)by default
- BCM defective(LF door ajar switch status)