Principles of Operation

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 hood ajar switches, or trunk tamper switch it sends a ground signal to the smart junction box. When the smart junction box (SJB) receives a signal indicating intrusion into the vehicle, the SJB supplies a ground signal to the horn control relay and the parking lamps relay. The relay closes, supplying the power which activates the horn and the parking lamps. The pulse stretcher module applies to wagons only. Due to the distance between the liftgate disarm switch and the SJB, the disarm switch signal is not present long enough for the SJB to recognize. The pulse stretcher module receives pulse input when switch is turned to unlock. The pulse stretcher module holds the pulse active for about 60ms so the SJB can recognize the signal and disarm the system. 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:
- unlock is pressed on the RKE transmitter.
- the keyless entry keypad code is entered.
- the door, luggage compartment lid or liftgate lock cylinder is turned to unlock.
- the ignition switch position changes to RUN or START.