Anti-Theft - Perimeter

ANTI-THEFT - PERIMETER

The perimeter anti-theft system consists of the following:
- door lock cylinder switches
- liftgate lock cylinder switch
- generic electronic module (GEM)
- door ajar switch
- keyless entry remote transmitter
- hood switch/bracket assembly

For more information on the generic electronic module (GEM), refer to Body Control Systems (Multifunction Electronic Control Module).

For more information on the keyless entry remote transmitter, refer to Locks.

PRINCIPLES OF OPERATION

Perimeter - Anti-theft
The perimeter anti-theft feature provides an audible and visual alarm when unauthorized access to the vehicle is detected. When an intrusion is detected by any door, liftgate or liftgate glass ajar switches, or the hood switch, an open signal is sent to the generic electronic module (GEM). When the GEM receives a signal indicating intrusion into the vehicle, the GEM cycles a ground supply to the headlamp, flashers and horn relays. The relays close causing the headlamps and flashers to flash and the horn to sound. The perimeter anti-theft feature does not arm until 20 seconds elapses after the GEM receives a lock command and detects all ajar switches are closed. If all switches are closed the flashers will flash and the system will immediately arm. The perimeter anti-theft will disarm only when:
- UNLOCK is pressed on the keyless entry remote transmitter.
- UNLOCK is received from the door or liftgate key cylinder switches.
- ignition switch is turned to RUN (prior to alarm trigger).
- PANIC is pressed on the keyless entry remote transmitter (effective only when the alarm is sounding).