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WTF happened to my BCM?

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Old 04-02-2017, 07:12 PM
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Default WTF happened to my BCM?

So I am suddenly having the dreaded radio troubles, with my radio shutting off intermittently. I popped out my BCM to fix it, only to find this:


Huh. Weight reduction by the previous owner?



$h!t



Why on earth...


So now I have a feeling I am up the creek without a paddle. What are my options?

Get a new BCM?
Since I was thinking about doing a complete overhaul and eliminating all of the nonessentials such as interior lights, could I go with a digital dash instead(and a different EFI system), and be able to completely bypass it altogether?

If I can bypass it, is there a way to retain my aftermarket sound system?
Old 04-03-2017, 01:55 AM
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What in the... How did your BCM even work!?

All the BCM does is supply power to the radio. You can retain the aftermarket system by supplying a constant power source, and a switched 12v source that comes on with accessory or ignition.
Old 04-03-2017, 07:17 AM
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What could I do about the windows? I'd like to keep them, but I'm not sure what to do with those.
Old 04-03-2017, 08:40 AM
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The GM part number is 9353691, available from Rock Auto for $159 plus a core charge of $40.
Old 04-03-2017, 03:18 PM
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Just out of curiosity, I read somewhere that if I delete VATS on my PCM, I should be able to run a used BCM, right?
Old 04-03-2017, 03:32 PM
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No. It is not possible to completely remove VATS by programming. The BCM is not programmable so even though you can program the PCM to ignore the lack of a fuel enable signal from the BCM, that doesn't do anything for the starter relay disable in VATS. You would have to physically rewire the starter relay to bypass that and even then you would still have the security light always on in the instrument cluster.

You can install a used BCM but you either have to get the original ignition key (to read the resistor pellet value) or you have to go through the 14 possible resistor values until you find the one that works (actually only 13 since you already have your original key). Then you get a new key cut to match yours but with a resistor pellet that matches VATS. Or you can use the resistors to bypass VATS. Or you could get 13 new ignition keys cut matching your ignition, each with a different resistor value, then try them until you find the one that works (that's not as crazy as it might sound because you can get all of the keys cut for around $20 and it's easier than crawling under the dash to try different resistors).
Old 04-03-2017, 03:36 PM
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You can keep windows with no BCM, apply power to the brown wire at the black box/switch. They will work.
Old 04-03-2017, 03:38 PM
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Who cuts chipped keys? My local Chevy dealer says they don't stock them
Old 04-03-2017, 03:46 PM
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Any locksmith can do it. Your dealer can too, they just have to order the blanks rather than having them in stock. You may even find them at Lowes or Home Depot.
Old 04-03-2017, 03:53 PM
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I've never been able to find chipped ones. Would I be able to take the resistor out of the old one and put it in the new one?
Old 04-03-2017, 06:18 PM
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Easy fix, PM sent.
Old 04-03-2017, 06:28 PM
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Originally Posted by JOHNNY59
Easy fix, PM sent.
Must be one heck of a secret
Old 05-04-2017, 06:53 AM
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Is that buckshot from an angry dad/boyfriend?

Did the PO mount something to the bottom of the dash by drilling a bunch of holes?



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