The Content Theft Deterrent System is designed to sound the horns and flash the exterior lamps when the system is armed and when the Body Control Module (BCM) detects an unauthorized entry. An unauthorized entry can be any of the following conditions:

Operation of the horns and exterior lamps when activated, is controlled by the BCM. When the alarm is active, the BCM cycles the Horn, Low Beam, and Park Lamp Relays on and off once per second. During this cycle, ground is applied the respective relay's coil and then removed. This causes the relay to energize and de-energize.

The BCM will remain in the "Alarm" state for 3 minutes or until a valid input to disarm the BCM is received.

The arming sequence begins when the ignition is turned to the LOCK position and a door is opened. The next step occurs when the doors are locked either by the electronic door lock switches or by the RKE Transmitter (Key FOB). When the last door is closed, the BCM enters a "Delayed" state for 30 seconds and then proceeds to the "armed" state unless it receives a valid input to disarm. The security indicator lamp remains on until the lamp enters into the "Armed" state, see Security Indicator.

The arming sequence can be canceled by unlocking the doors electronically prior to closing the door. When the doors are unlocked, the BCM will arm and disregards the door being closed.

When the left front door is unlocked with a key, the Door Lock Switch closes. This grounds the door's input to the BCM. The system is then disarmed and the alarm state will not become active when the door is opened.

First Design RKE

When the Remote Control Door Lock Receiver receives a transmission from the Key FOB, it sends a Class 2 serial data message to the BCM to unlock the doors. This message will only be sent to the BCM if the Remote Control Door Lock Receiver recognizes the transmission as a valid Key FOB. Therefore the BCM recognizes this in the same manner as a valid door lock switch disarm input.

Second Design RKE

The Remote Control Door Lock Receiver is an internal part of the BCM for the second design RKE system. The system operates the same as the first design RKE system. All RKE functions are internal to the BCM.

Turning the ignition switch to any position out of LOCK will not disarm the system when the alarm is active.

The BCM grounds circuit XP840 in order to illuminate the security indicator lamp. The security indicator lamp reminds the operator to arm the system by flashing the lamp. The lamp indicates the system is arming when the lamp stays on steady. The system is armed when the lamp is off.