Section 24 (Body Control Modules): Description

WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Chevrolet Cavalier, 2001 Pontiac Sunfire, and 2001 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The Body Control Module (BCM) controls many vehicle functions. These functions include A/C compressor, audible warnings (chime), battery rundown protection, instrument panel cluster indicators and gauges, interior and exterior lighting, theft deterrent, keyless entry, rear compartment release, shift lock control (A/T) and panic horn.

The BCM communicates with other systems over a serial data line to execute various vehicle functions. This serial data line is referred to as the Class 2 serial data communication bus. Communication between each system is accomplished by sending digitally coded messages, which consist of specific information the system module must follow. Each system module is assigned its own recognition code, so that it can respond to appropriate messages.

Other modules that communicate with BCM over this line are Electronic Brake Control Module (EBCM), Powertrain Control Module (PCM), Instrument Panel Cluster (IPC), radio (IRC) and Sensing and Diagnostic Module (SDM).