Description & Operation

WARNING: Deactivate air bag system before performing any service operation. See AIR BAG RESTRAINT SYSTEM article. DO NOT apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy.

NOTE: Body Control Module (BCM) may also be referred to as Multifunction Alarm, Lock & Lighting (MALL) module.

The Body Control Module (BCM) controls different body systems by obtaining information from various sensors and switches, then using this information to command the output to each body system. Three different types of BCMs are available. BCM-2 performs the following functions: Illumination control, inadvertent load (battery run-down) control, chime/warning functions, retained accessory power, feature customization, and automatic door lock and unlock functions. BCM-3 provides the same features as BCM-2, and includes functions that allow BCM features to work with keyless entry system. BCM-4 provides the same features as BCM-2 and BCM-3, and includes remote activation verification, remote alarm, and content theft deterrent system functions.

When BCM activates the feature customization mode, the following functions can be customized: Interior lighting, automatic door lock features, keyless entry features and content theft deterrent features.