BCM Overview

The body control module (BCM) is a integrated module that combines functions and features from a normal control module and an body electrical center. There are 4 electrical interfaces that exist between the BCM and the rest of the vehicle. There are 2 connections from the BCM to both the body wiring harness and the instrument panel wiring harness. The BCM contains fuses and relays that are serviceable.

The main features of the BCM are:

• The BCM is the gateway between class 2 serial data circuit and high speed GMLAN serial data circuit.
• The BCM controls multiple functions.
• The BCM controls electrical power management.
• The BCM is the power mode master.