Arming/Disarming UTD
WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
When a lock command is received by Door Control Modules (DCMs), Body Control Module (BCM) will arm Universal Theft Deterrent (UTD) system. The BCM turns off courtesy lights and sounds vehicle horn indicating UTD is armed. When doors or hatch is unlocked, BCM disarms UTD.
To send a disarm UTD message to BCM, the following conditions must exist: a valid transmitter is in range, key is not in ignition, and remote control door lock receiver has identified unlock command or hatch release command from a valid transmitter.
To send an arm UTD message to BCM, transmitter LOCK button must be pressed when key is not in ignition.