Passenger Door Unlock Operation
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
When BCM detects a transition of either of the door lock switches to UNLOCK position, it switches door lock actuator unlock control circuits to voltage. Since door lock actuator lock control circuit is at ground potential within BCM, passenger door lock actuator motors transition to UNLOCK position.
Door lock actuator unlock control circuits are dedicated control circuits used only for passenger door lock actuator motors. This is done so that driver door may be unlocked separate from passenger doors using a keyless entry transmitter or an automatic door unlock function (if programmed).