Power Door Lock/Unlock Function
WARNING: This page is about a different car, the 2000 GMC Yukon, 2000 Chevrolet Tahoe, 2000 Chevrolet Pickup, and 2000 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
BCM is responsible for energizing door lock relay. Door lock relay will be energized whenever BCM receives a command from any door lock/unlock switch or remote transmitter.