Principles Of Operation

Autolamps

Principles of Operation

The autolamp system turns the exterior lamps on when the light available to the light sensor decreases below a predetermined level, such as at sunset. The lamps automatically turn off when the level of outside light exceeds a predetermined level, such as during daylight hours.

Placing the headlamp switch in any other position overrides the autolamps operation. Automatic operation is not possible until the headlamp switch is placed in the AUTOLAMPS ON position.

The autolamp time delay control defaults to 20 seconds unless changed by the operator. To change the time delay setting, refer to Autolamps Time Delay Adjustment Autolamps Time Delay Adjustment.

There is also a feature that turns on the exterior lamps when the windshield wipers are turned on. When the LCM detects a ground signal from the windshield wiper motor, the LCM turns the exterior lamps on. For diagnosis of the headlamps on with wipers on feature, refer to Wipers and Washers Testing and Inspection.