Anti-Theft - Perimeter

Anti-Theft

Principles of Operation

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

When the perimeter alarm is armed, the SJB (Smart Junction Box) monitors the door ajar switches, the hood switch, the luggage compartment lid ajar switch, and the Body Control Module B (BCM-B) sends a message over the local interconnect network to arm the intrusion and inclination sensor.

If any intrusion is detected without the alarm being deactivated, the SJB (Smart Junction Box) activates the perimeter alarm and sounds the horn and flashes the turn signals in regular intervals.

The system arms when:

- the driver door is locked with the key in the door lock cylinder (which does not activate the intrusion or inclination systems)

- the doors are locked with the Remote Keyless Entry (RKE) transmitter (this arms the entire system)

- the doors are locked with the door lock control switch (with the door open) and then the accompanying door is closed (this also arms the entire system)

If the doors are locked using the manual push buttons, no part of the perimeter alarm is armed. The SJB (Smart Junction Box) monitors the status of all entry points. If any entry point is open, the alarm arms everything except for the open entry point. The SJB (Smart Junction Box) adds the entry point to the protected status when the closure of the open entry point is detected. Note that only when the system is armed by locking the door using the key in the door lock cylinder is there no intrusion/inclination protection. Arming the system (locking the doors) using the RKE (Remote Keyless Entry) transmitter or using the door lock control switch allows the intrusion/inclination protection to also arm.

NOTE: The intrusion sensing feature is not activated if either door or the convertible top (if equipped) is open when the vehicle is armed.

The SJB (Smart Junction Box) inhibits the intrusion and inclination sensor and the luggage compartment lid ajar inputs if the luggage compartment lid is opened with the RKE (Remote Keyless Entry) transmitter. Once the luggage compartment lid is closed, the intrusion and inclination sensor and the luggage compartment lid ajar switch are monitored by the SJB (Smart Junction Box).

Perimeter Alarm Arming

The system can be armed using any of the following methods:

- Press the door lock control switch to the lock position with the accompanying door open, then close it (then wait 20 seconds for the pre-arm phase to expire)

- Press the LOCK button on the RKE (Remote Keyless Entry) transmitter (then wait 20 seconds for the pre-arm phase to expire)

- Turn the key in the door lock cylinder to the lock position (then wait 20 seconds for the pre-arm phase to expire). This is the only way to arm the perimeter alarm system without also arming the inclination/intrusion feature

Perimeter Alarm Disarming

The system can be disarmed using any of the following methods (these steps also deactivate an activated alarm):

- Press the UNLOCK button on the RKE (Remote Keyless Entry) transmitter (part of the IKT (Integrated Keyhead Transmitter) key)

- Turn the key in the door lock cylinder to the unlock position

- Turn a programmed Passive Anti-Theft System (PATS) key in the ignition lock cylinder to the ON position

Perimeter Alarm Deactivation

To deactivate an activated alarm (this step will not disarm the alarm), press the PANIC button on the RKE (Remote Keyless Entry) transmitter.

Alarm Event PIDs

The SJB (Smart Junction Box) has PIDs available that show what caused the last alarm events. The 4 SJB (Smart Junction Box) alarm event PIDs are AL_EVT1 through 4. The cause for the most recent alarm activation is always listed in the first alarm event PID. These PIDs display what caused the alarm to activate and can be a very useful tool when trying to identify the cause of a false alarm activation.