Body Control System Description & Operation: Notes

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.