Body Control Module

WARNING: This page is about a different car, the 2001 GMC Safari and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Body Control Module (BCM) is capable of accomplishing multiple body control functions. Components directly connected to BCM are controlled by BCM outputs. BCM controls outputs based on input information it obtains from sensors and switches that are directly connected to BCM, or by receiving information from other vehicle systems connected to class 2 serial data circuit. BCM evaluates this information and controls certain body systems by commanding an output on or off.

BCM is also capable of commanding other vehicle systems to control functions that are not directly wired to and/or controlled by BCM. BCM accomplishes this task by sending specific messages on class 2 serial data circuit. Vehicle system capable of performing such function will respond to BCM message.