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So I have two questions regarding this:

  1. What is the BCM and what does it do?
  2. They asked me to give them certain code numbers which came with my car manual and are unique to my car to them. They said they needed it to reprogram the BCM. What is the significance of those code numbers?
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up vote 16 down vote accepted

The Body Control Module is a computer which controls many things in your car not directly related to the engine. Instead of large wiring looms circuits all over the car all the buttons connect to a single computer which in turn turns on the headlights, open the windows, control the central door locking, etc. =A good example is the VAGCOM system in Volkswagens and Audi's.= see comment)


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VAGCOM (now called VCDS) is just a third party software to configure controllers in VW vehicles; it isn't a "system" and it isn't part of the vehicle. – user5106 Dec 26 '14 at 18:16



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The BCM (Body Control Module) is the electronic control unit that monitors and controls all of the systems in the car body. Electric windows,A/C functions, electric mirrors,electric locks,security systems, etc. It communicates with all the other modules via the cars vehicle bus. It drives all the relays the control all the nice gadgets. As with all the vehicular modules it generates fault codes for problem diagnosis.

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bcm= body control module

it is one of many computers in modern cars. It reports back to the main computer with trouble codes. read on a scanner unit most shops should but probably don't have.the bcm involves accessories like windows up and down, and a bunch of other things.

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protected by Zaid Dec 10 '15 at 20:10


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