Principles of Operation: Notes

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

The SJB controls the operation of the perimeter alarm based on inputs from all the ajar switch inputs, keyless entry keypad, driver door lock cylinder set/reset switch, and the Remote Keyless Entry (RKE) transmitters. If the SJB receives an input indicating an unauthorized entry into the vehicle, the SJB activates the perimeter alarm. When the perimeter alarm is activated, the horn sounds and both the turn signals and courtesy lights flash in regular intervals.

The SJB module receives hardwired inputs from the door lock control switches, hood switch, all door ajar switches, and the liftgate ajar input from the liftgate latch (manual liftgate) or the Liftgate/Trunk Module (LTM) (power liftgate) and the keyless entry keypad. The SJB also receives wireless signals from the Integrated Keyhead Transmitter (IKT).

If the driver door is unlocked by using a key in the door lock cylinder and then opened, the perimeter alarm starts a 12-second countdown. During the 12-second countdown there is a chime from the Instrument Cluster (IC) and the message center displays "TO STOP ALARM START VEHICLE". If the alarm is not deactivated during this countdown, the perimeter alarm activates.

Once the SJB receives the inputs, it either activates, deactivates, or triggers the perimeter alarm.