Test A: The Control Illumination Is Inoperative

PINPOINT TEST A: THE CONTROL ILLUMINATION IS INOPERATIVE

A1-A2:

A3-A5:

Normal Operation
The lighting control module (LCM) receives voltage from the central junction box (CJB) on circuits 54 (LG/YE) and 905 (GY/LB), and is grounded through circuit 676 (PK/OG). When the headlamp switch is in the parking lamps or headlamps ON positions, the LCM generates a variable pulse width modulated (PWM) voltage which is distributed to the dimmable components on circuit 484 (OG/BK). Light intensity is adjusted by rotating the instrument panel dimmer switch.

Possible Causes
- fuse(s)
- circuit 54 (LG/YE) open
- circuit 484 (OG/BK) open or short to ground
- circuit 676 (PK/OG) open
- circuit 905 (GY/LB) open
- LCM