Body Computer Module
WARNING: This page is about a different car, the 1990 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.
The Body Computer Module (BCM) controls the exterior lighting system. The theft deterrent controller provides an input to the BCM to activate the lights when the system is triggered. Additionally, the BCM provides a disarm signal to the theft deterrent controller when the central unlocking feature is activated from the trunk lock cylinder.