The Theft Deterrent System is a subsystem of the Body Control Module (BCM). This system uses a Security LED, located in the Center Floor Console, to indicate to the operator the security mode. The BCM enses the position of all door jamb switches to control the lock function during alarm arming. The following circuits connect the BCM to the door jamb switches:

The BCM will only arm the Theft-Deterrent System when it senses that the doors to the above circuits are closed. If the door lock function is detected, by the transmitter only and doors are closed, power is sent to the Door Lock Inversion Module through CKT 244 (LT BLU) locking the doors and the alarm is armed (This will be noticed by the two horn chirps and headlight flash, plus the Security LED will flash, once every two seconds). If the tailgate or panel doors are open the horn will chirp once. When the lock function is detected by the vehicle's door lock switch or the transmitter lock function and any door is open. The alarm will go into "wait" mode and arm once all doors are locked (This is noticed by the headlights flash).

Disarming the Theft-Deterrent System is accomplished when the BCM sends power to the Door Lock Inversion Module through CKT 245 (DK BLU). In this mode the Security LED is off.

Power is fed to the BCM at all times from the CTSY fuse #3, through CKT 149 (BLU/WHT). Power is supplied to the Security LED from the BCM through CKT 1376 (DK GRN). Power Ground for the BCM and the Security LED, located in the Center Floor Console, is provided at ground G202 through CKT 150 (BLK). Logic Ground for the BCM is provided through CKT 150 (BLK) to ground G200. Ground is provided to the following components by the BCM when arming mode has been set: