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I was looking for a BCM replacement tutorial and couldn't find one so I figured, "Hey, I've gotten lots of help from LS1tech, maybe its time to give back" So, I took some pictures, thought up some steps, and here is the finished product-------------------------------*Disclaimer: I am not responsible for damage to any vehicles by anyone who attempts this repair. This tutorial is to be used as a suggestion only. If you can't do it, don't do it.*
I got a replacement Body Control Module that was thrown in with a steering column I bought on ebay. This is how I replaced my old one in a 2000 TA. My car was missing a bunch of bolts/screws so If you encounter some that I didn't mention, just let me know.
Tools needed: Phillips Screwdriver, Flathead screwdriver, 8mm socket/wrench, 7mm s./w.,Pliers, Some sort of hammer, flashlight
1. The first thing you will want to do is disconnect the negative terminal on your car battery. (This is probably unnecessary, but I would do it anyways just to be on the safe side.)
2. The BCM is on the passenger side of your car under the Dash. You will need to take out the passenger side knee panel. (In my car there were 4 phillips head screws, however I doubt they were stock.)
Workspace
3. Once that is done, You will need to take out the glove box. There are 3 7mm screws that you need to take out. After they are out, it should drop right out.
Screw locations
4. After this, you should be able to see the BCM in its slot. However in order to take it down, you have to remove the floor to door plastic panel. There are 4 phillips screws.
6. Next, you have to unclip the wiring harness (Bundle of wires) from the knee panel support.
Clip
7. Move the harness out of the way, and pull the BCM down out of the slot.
8. Now, Disconnect the wires from the BCM. (It wouldn't be a GM clip if it weren't hard to get out.) The blue clip is all you need to take off of the main wires, and the green/ grey clips just need to be pushed in on one side.
SUCCESS! You now have disconnected your old BCM.
If you are not bleeding by this point, you are doing very well. I took a chunk of finger out with a screwdriver.
Things to think about when putting back together:
Test your new BCM before you put it into its slot. (You wont regret this) Use a mallet to put the floor to door plastic panel back in. While putting your Glovebox back in don't screw the bottom in while it is closed. Keep it open until finished. If your BCM is used, and you don't have a matching key there is a 11/12 chance you will need to either take it to the GM dealership or do a VATS bypass. I hope this helps. Feel free to ask any questions. Thanks, Motopilot
I know that this is an old thread and I had the same problem however mine turned out differently. I bought a used bcm connected everything and it was still doing the same issue. I checked my old bcm and new bcm and the solders looked fine. It wound up being a loose wire (blue with white stripe) in the black harness. My father popped out every wire and reconnected them until they clicked in and he noticed the blue wire with the white stripe was giving a hard time. He finally managed to get it to click into the harness and now the issue is completely gone. Just another option to look into.
I know that this is an old thread and I had the same problem however mine turned out differently. I bought a used bcm connected everything and it was still doing the same issue. I checked my old bcm and new bcm and the solders looked fine. It wound up being a loose wire (blue with white stripe) in the black harness. My father popped out every wire and reconnected them until they clicked in and he noticed the blue wire with the white stripe was giving a hard time. He finally managed to get it to click into the harness and now the issue is completely gone. Just another option to look into.
I have this problem off & on. Thanks for the loose wire tips before I try to fix or replace 😎
From: Jacksonville, FL (originally from Toronto Canada)
Originally Posted by lvgoldie
I have this problem off & on. Thanks for the loose wire tips before I try to fix or replace 😎
Although it certainly is possible to have a loose wire, it is extremely unlikely in a vehicle where the BCM has been previously undisturbed. Both the BCM and the wire harness are fairly tightly mounted so there is no movement which could eventually cause a wire to work its way loose. Assuming you have the common RAP circuit cold solder problem (radio and windows cutting out), you should plan on doing the solder repair and then you can also check for loose wires when reinstalling the BCM.
From: Jacksonville, FL (originally from Toronto Canada)
Originally Posted by Nivlac
If I already have a Vats bypass does it matter what BCM I purchase? I was told the numbers need to match. Thanks
What options are you considering? All 97-02 F-bodies use the same BCM - superseded from a couple of different ones based on whether the optional alarm system was installed.
You WILL have to redo your VATS bypass to match the key resistor value of a used BCM because they cannot be reprogrammed. A new BCM will automatically match itself to the "key" first used to start the car after installation and then cannot be changed after that.
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BCM Replacement W/Pics. 
