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What is body control module diagnosis and testing and how does it work?
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.
HOW IS THIS SERVICE PERFORMED?
How is a a Body Control Module Diagnosis and Testing done?
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:
Inspect wiring harnesses and connectors
Run pin out testing on the wiring harnesses
Run one or more function tests on the components using the diagnostic tool
Monitor live data on the diagnostic tool to see the component feedback data in real time
Check fuses of associated components
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POPULAR VEHICLES
National average cost of a a Body Control Module Diagnosis and Testing for popular vehicles:
Car Model
Avg. cost
$50
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How do I know if my vehicle needs body control module diagnosis and testing?
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:
Check engine light
Faulty power windows, power locks, or power seats
Air conditioning not functioning properly
Engine will not start
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Other questions customers ask
Will a faulty BCM throw a code?
Yes, any problem related to a system controlled by the body control module (BCM) will set a diagnostic trouble code and turn on the check engine light. That includes a fault with the BCM itself.
How do I fix my body control module?
The body control module or BCM typically cannot be serviced or repaired, it can only be replaced. If you suspect your vehicle has a bad BCM, have it inspected by a qualified technician. If it is deemed faulty, a replacement will be required.
Is there a fuse for the body control module?
Yes, there is typically a large fuse designated to protect the body control module electrical circuit, as well as other smaller fuses for related systems that are powered or controlled by the body control module.
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