Door Lock and Unlock Operation
WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
When the driver or passenger door lock switch is activated in the lock or unlock position, the BCM will receive a ground signal on either the door lock switch lock or unlock signal circuits.
The BCM, upon receipt of a lock switch lock or unlock signal, will supply battery voltage to the door lock actuator lock or unlock control circuits. Since the opposite side of the lock actuator is connected to ground through the other lock actuator control circuit, the doors will then lock or unlock as commanded.
The following three circuits are used to operate the lock:
- Driver door unlock
- Passenger door unlock
- All door lock
The driver door lock actuator is isolated so it can be unlocked by itself using the keyless entry transmitter.