Operation CHARM: Car repair manuals for everyone.

System Operation

The body control module used in this vehicle controls the lighting system through circuits that enable both the exterior lamp functions of park, head and fog lamps as well as the interior lamps. The BCM opens these enabling circuits 10 minutes after the ignition switch is turned OFF with no lamp switch activity. If the ignition switch is turned to any position other than OFF, or if a lamp switch is activated, during this 10 minute period the timer will reset for another 10 minutes. The time is reduced to 3 minutes until the vehicle mileage is more than 22.5km (14mi) +/- 2.2km (1.4mi).