Central Unlocking Feature
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.
When either of the door lock cylinders or the trunk lock cylinder is turned twice within a ten second period the Body Computer Module (BCM) will activate the door unlock output. The BCM therefore controls the central door unlocking feature. Additionally, when the central unlocking feature is activated from the trunk lock cylinder, the BCM disarms the alarm system by activating the alarm disable output.