Body Control Module: Description and Operation

The Body Control Module (BCM) controls a number of functional systems. The BCM is connected to the class 2 serial data line. Many control signals are implemented by class 2 messages.

The BCM functions include the following:
^ Ajar switch and tamper switch inputs from the rear compartment lid
^ Auxiliary chime control
^ Control of headlights and exterior lamps
^ Heated seat controls
^ I/P dimmer switch input
^ Interior lamps incandescent dimming
^ Interior lamps switch input
^ Key in ignition switch input from the ignition switch
^ Low coolant sensor input
^ Power moding control over Class 2 serial data line
^ Rear compartment lid release control
^ Rear defogger control
^ Retained Accessory Power (RAP) control
^ Seat belt reminder/warning control
^ Steering wheel controls
^ Traction control switch input
^ Various controls for the interior lamps