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Old 03-20-2006, 05:14 PM   #1
kpatz
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Default What does the BCM do, exactly?

As a relative newbie to this site, I keep reading about BCMs. I know what the PCM is, it's the computer that runs the engine, tranny, etc. But what does the BCM do, in a S-series in particular? Keyless entry/security? Does it do anything else?

Just curious...

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Old 03-20-2006, 10:43 PM   #2
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Default Re: What does the BCM do, exactly?

Quote:
Originally Posted by kpatz
As a relative newbie to this site, I keep reading about BCMs. I know what the PCM is, it's the computer that runs the engine, tranny, etc. But what does the BCM do, in a S-series in particular? Keyless entry/security? Does it do anything else?

Just curious...
BCM = Body Control Module

this divice integrates all you electrical accesories. it controlles your power locks, windows, lighting and factory security system. It is also the comunication hub. Your PCM, airbag cotroller and ABS system are linked to it so they can be accessed by your OBD II connection.

so if you add factory power locks from a scraped sl2 to your sl you would have to have your BCM updated by the dealer to have the logic to make the door locks work.

hope this explained it for you

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Old 03-20-2006, 11:26 PM   #3
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Default Re: What does the BCM do, exactly?

That is a good explaination. The BCM also monitors all those systems and will set codes for malfunctions. See this link for just a few!


http://www.saturnfans.com/forums/sho...ighlight=obdii

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Old 03-20-2006, 11:58 PM   #4
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Default Re: What does the BCM do, exactly?

But aren't they only on 2000 and up models?

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Old 03-21-2006, 03:26 AM   #5
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Default Re: What does the BCM do, exactly?

2000 and UP "S" series (and the "L" of course which appeared in 2000. And in all Saturns made since then.

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