Test A: The Interior Lamps Are Inoperative

PINPOINT TEST A: THE INTERIOR LAMPS ARE INOPERATIVE

A1-A5:

A5-A7:

A7-A8:

Normal Operation
Fuse 18 (15A) in the central junction box (CJB) provides power through circuit 54 (LG/YE), to the lighting control module (LCM). The driver door module (DDM) monitors the LH front door ajar switch on circuit 867 (DB), and the remaining door ajar switches on circuit 627 (BK/OG). The door ajar switches provide a path for ground supplied through the ajar switches by circuit 57 (BK), indicating an open door. The DDM then signals the LCM to supply power to the interior lamps on circuit 53 (BK/LB). The interior lamps are grounded through circuit 57 (BK).

Possible Causes
- Fuse
- Circuit 53 (BK/LB) open or short to ground
- Circuit 54 (LG/YE) open or short to ground
- Circuit 57 (BK) open
- Door ajar switch
- LCM