Passive Locking & Unlocking
WARNING: This page is about a different car, the 1997 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
With passive locking and unlocking feature, a motion sensor in transmitter causes transmitter to send an identification code to remote control door lock receiver. The receiver sends a signal to Door Control Module (DCM) on the serial data line to lock or unlock the driver door or both doors (depending on selected options). The DCM then locks or unlocks driver door or both doors. The Body Control Module (BCM) arms or disarms Universal Theft Deterrent (UTD) system. When unlocking, BCM will also turn on courtesy lights if ambient light is low.