Vehicles With Intelligent Access (IA)

Anti-Theft


Principles of Operation - Vehicles With Intelligent Access (IA)

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

The Remote Function Actuator (RFA) module monitors the door ajar switches (they are open with the door closed and closed with the door open), the hood switch (closed with the hood closed and open with the hood open) and the luggage compartment lid ajar switch (closed with the luggage compartment lid closed). If the perimeter alarm has been armed when the RFA module receives an ajar signal, indicating unauthorized entry into the vehicle, it broadcasts a message over the Medium Speed Controller Area Network (MS-CAN) to the SJB, after which the SJB intermittently (in regular intervals) grounds the horn relay and also intermittently (in regular intervals) sends voltage to the turn signal lamps. The horn relay closes, supplying voltage to the horn. The SJB cycles the ground to the horn relay and voltage to the turn signal lamps, on and off, while the system is activated.

An activated alarm can either be deactivated or disarmed. Pressing the PANIC button on the Remote Keyless Entry (RKE) transmitter deactivates the perimeter alarm, but does not disarm the alarm. The RFA module monitors the ignition state and does not allow the perimeter anti-theft feature to arm until after the ignition state has transitioned to the OFF mode, all doors/hood/luggage compartment lid are closed and 20 seconds have elapsed after locking the vehicle. Each input has its own 20-second pre-arm phase, depending on when it was closed after the arm command was given (when the doors are electronically locked). After all of these criteria have been met, the perimeter anti-theft alarm feature arms.

Pressing the PANIC button on the RKE transmitter deactivates the perimeter alarm, but does not disarm the alarm.