Module, Body Control (BCM): Description

WARNING: This page is about a different car, the 2021 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

A Body Control Module (BCM) is an Electronic Control Unit (ECU) with a microcontroller that controls and integrates many of the main body electronic functions and features of the vehicle. Many of the functions and features provided by the BCM are possible because of numerous hardwired inputs and outputs, but most of these features are only possible or are enhanced because the BCM communicates electronically with other ECUs in the vehicle as well as with a diagnostic scan tool using the Controller Area Network (CAN) data bus.

The BCM is located behind the passenger side door kick panel. The BCM has a molded plastic case that is secured with fasteners within stamped metal brackets that form a mounting yoke. The yoke is then secured with fasteners to a metal support structure. The BCM is connected to the vehicle electrical system through wire harness connections.

The BCM is a gateway between the high and low speed CAN data bus networks as well as a Local Interface Network (LIN) master node. This method of communication allows the sharing of sensor information, which reduces wire harness complexity, internal ECU hardware and component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics and allows the addition of many new feature capabilities. This method of communication is used by the BCM to acquire vehicle configuration data, including customer programmable features.