Body Control Module (BCM)

The BCM includes the logic and control circuits for the VTA. Each of the ajar switches provides hard wired inputs to the BCM, while the BCM provides control outputs to the vehicle horns and lighting systems. In vehicles not equipped with the optional PEKG system, the BCM also monitors the status of the ignition switch through a hard wired input. In vehicles equipped with the PEKG system, the RFH monitors the status of the KIN through a private security K-line data bus and relays this information to the BCM as electronic messages transmitted over the CAN-C data bus.

Inputs: 

• Key in ignition status
• All door, tailgate and hood ajar switch status
• Power mode status
• Key status
• Operation mode status
• Intrusion attempt status
• Remote start activity

Outputs: 

• Audio alert initiation
• Alarm indication to IPC
• Theft alarm status on CAN-C data bus
• Alarm cause status on CAN-C data bus
• Lighting alert initiation
• Theft alarm status to the RFH

The BCM reads all hard wired ajar switch inputs through an internal pull-up resistor, then uses this input to control other electronic functions and features of the vehicle. The BCM may also send electronic ajar switch status  to other electronic modules in the vehicle over the CAN-C data bus.