Without Intelligent Access (IA)
The Body Control Module (BCM) controls the operation of the perimeter alarm based on the following inputs:
- the door ajar switch inputs
- liftgate ajar input
- hood switch input
- keyless entry keypad
- door lock control switches
- Passive Anti-Theft System (PATS) input,
- Remote Keyless Entry (RKE) transmitters
The BCM receives direct input from all the ajar switches, the hood switch, keyless entry keypad, the door lock control switches, and the PATS transceiver. It receives messages from the Tire Pressure Monitor (TPM) module over the Medium Speed Controller Area Network (MS-CAN) for the RKE feature.
If the perimeter alarm is armed and the BCM receives an input indicating an unauthorized entry into the vehicle, or the ignition is transitioned to the RUN mode without a programmed PATS key, the BCM 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.
If the driver door is unlocked and opened using a key in the door lock cylinder, the perimeter alarm starts a 12 second countdown. During the countdown a chime sounds and the message center displays TO STOP ALARM START VEHICLE.
If the alarm is not deactivated during this countdown, the perimeter alarm activates.