Operation CHARM: Car repair manuals for everyone.

Auto Headlamps

The headlamps and park/tail lamps will be activated by the BCM when the headlamp switch is in the auto mode. To activate the auto headlamps the BCM requires that:
1. The headlamp switch is in the "A" position
2. The engine is running
3. The light level sensed through the sun load sensor falls below the calibrated level