Active Anti-Theft Systems: Description

The anti-theft system is designed to prevent unauthorized entry into passenger's compartment, luggage compartment and engine compartment. When alarm is triggered, horns sound and exterior lights flash. Vehicles may have one or 2 standard horns, in addition to anti-theft system horn. This system also disables engine from starting. Some system functions tie in with Remote Keyless Entry (RKE) system. For more information on RKE system, see POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEM - FOCUS article.

When armed, unauthorized entry is detected by ajar switches located in each door. An anti-theft indicator LED is located on the instrument panel. Models with an electronic door lock system have a panic feature that operates in conjunction with the anti-theft system and remote keyless entry system. When the panic button on the remote transmitter is pushed, horns will sound and the exterior lights will flash.

The anti-theft system utilizes a self-diagnostic system which may store a Diagnostic Trouble Code (DTC) if a problem exists in the system. DTCs may be retrieved using a New Generation Star (NGS) tester.

When the generic electronic module (GEM) receives a signal from a monitored switch indicating intrusion into the vehicle, the GEM supplies a ground signal to the horn control relay and the hazard warning turn signal lamp. The relays close, supplying power to the horn(s) and the turn signal lamp flasher relay. The GEM also supplies power to the anti-theft horn. The GEM cycles the output to the relays and anti-theft horn on and off while the system is activated. The perimeter anti-theft feature does not arm until 20 seconds elapses after locking the vehicle. The perimeter anti-theft device will disarm only when an unlock request is made through the remote transmitter or if any driver door, passenger door, luggage compartment or liftgate key cylinder is turned to unlock position.