The body control module, or BCM, is one of the many onboard computers in your vehicle. The BCM relies on data from an array of sensors and switches all around the vehicle to monitor and control vehicle systems. These systems include interior components such as your power windows and heated seats. But it also oversees safety systems, like the supplemental restraint system (air bags). The BCM might also control the air conditioning, anti-theft, and other systems as well. Simply put, the BCM is the main computer for anything that is not directly related to or controlling the engine and transmission.
The body control module, or BCM, controls a wide variety of items in your vehicle, including things such as the power windows, power locks, security system, air conditioning, and even your heated seats. Unless it is a part of the engine or transmission, the BCM probably controls it or communicates with it in some fashion. Because of this, signs of a faulty BCM can number in the hundreds, and can be extremely difficult for technicians to troubleshoot and diagnose. Some of the more common signs of a faulty BCM may be:
As with any electronic diagnostic test on a vehicle, diagnosing the BCM usually consists of connecting a diagnostic scan tool to your vehicle’s data port and verifying which (if any) systems display errors or show a lack of communication with the main computer. If a specific system shows an error code or is not properly communicating with the BCM computer (and/or diagnostic tool), the technician may perform any of the following actions:
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