Body Control System

BODY CONTROL SYSTEM DESCRIPTION AND OPERATION

The body control module (BCM) is wired to the GMLAN High speed serial data buss, and the GMLAN Low speed serial data buss, as well as discrete input and output terminals to control the functions of the vehicles body systems.

Power Mode Master
This vehicles body control module (BCM) functions as the power mode master (PMM). Refer to Power Mode Description and Operation for a complete description of power mode functions.

Serial Data Gateway
The body control module (BCM) in this vehicle functions as a translator between the High and Low speed GMLAN busses. The 2 communication protocols use the BCM to translate communicated serial data messages between the control modules over the 2 serial data busses.

Body Control Module
The various body control module (BCM) input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The BCM functions include the following:
- Exterior lighting-Refer to Exterior Lighting Systems Description and Operation.
- Instrument cluster indicator control-Refer to Instrument Panel Cluster (IPC) Description and Operation.
- Interior lighting-Refer to Interior Lighting Systems Description and Operation.
- Retained accessory power (RAP)-Refer to Retained Accessory Power (RAP) Description and Operation.
- Remote function control-Refer to Keyless Entry System Description and Operation.
- Seat belt use sensing-Refer to Seat Belt System Description and Operation.
- Vehicle theft deterrent-Refer to Vehicle Theft Deterrent (VTD) Description and Operation.
- Wiper/Washer System functions-Refer to Wiper/Washer System Description and Operation.