Illumination Lamps

CIRCUIT OPERATION
The display intensity of the instrument cluster, radio, HVAC control, and various other items in this vehicle is controlled by the Body Control Module (BCM).

Circuit E2 supplies power to the lamps controlled by the BCM.

Circuit L7 supplies power to fuse 1, a 10 amp in the junction block, when the park lamp relay is energized. Circuit E1 connects from the fuse to the BCM and supplies a park lamp ON input.

The E92 circuit from the headlamp dimmer switch provides the dimmer switch signal to the BCM. The BCM measures the resistance to ground on this circuit and adjusts the Voltage level on circuit E2 to the proper level.

Ground for the lamp(s) is supplied on circuit Z1. This circuit is spliced internal the HVAC control and also supplies a power ground for the control and blower motor.