Body Control Module (BCM)
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The CTD system is an internal function of the BCM which utilizes serial data and various switch input information to perform CTD functions. When the BCM detects an unauthorized entry, it activates the horns and exterior lamps. The BCM has 4 basic modes (disarmed, standby, armed and alarm) for operating the CTD system. The different modes are described below.
- The BCM has the CTD system in a disarmed mode until the following conditions are detected:
- Ignition key turned to the OFF position.
- Any door open.
- Doors locked by either the power door lock switch or the LOCK button on the keyless entry transmitter.
- The BCM enters the standby mode when the above conditions are detected and a vehicle door is open. In standby mode, the BCM commands the theft LED to flash quickly. If all the doors are closed and the LOCK button on the transmitter is used, the BCM enters the delayed mode.
- When the last door is closed, the BCM enters the armed mode. In armed mode, the BCM commands the theft LED to flash slowly.
- When the BCM detects a forced entry, the BCM enters the alarm mode. The BCM activates the horns and exterior lamps for 30 seconds. This is followed by a 3 minute time-out with the horn no longer active. If no new intrusions are detected after the time-out, the horn is not active. The system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode.