BCM Wiring Harness Chafing - Pontiac GTO Forum
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post #1 of 7 (permalink) Old 09-15-2010, 07:20 PM Thread Starter
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BCM Wiring Harness Chafing

Checking to make sure your BCM wiring harness is not chafing:

If one removes the glove box, the BCM is visible behind and up to the left under the dash. Behind the glove box once it's removed you will see a metal bracket that runs parallel to the dash with a notch cut out on the right side.

The cable that runs to the BCM runs vertically (which is hidden behind the glove box but visible one its removed) to it but as many have reported I was told, the wiring harness rests against the bracket at that notched cut out. From vibration and over time it chafes against the metal causing the casing to wear through exposing bare wires, some have reported BCM issues and this was found the chafing to be the culprit. A few in our club took their glove box apart and found their wires were chafing as well. My BCM was changed years ago and the new one installed the wires were not in contact.

The fix: Some have added rubber tubing to help insulate it. Although I had no issue and since my glove box was removed, I wire tied the harness to: If you look over at the fender from inside the glove box area there is a round bracket or brace that runs vertical in front of the fender. I wire tied the harness to that bracket just as a precaution. This allows ample room between the wiring harness and that bracket.

To remove the glove box: With the glove box open, look to the left side wall of the interior you will notice a rubber plug about about 1-1/2" long. Carefully pry this off while holding the glove box. There is an identical plug on the right hand side, leave that one alone. Once the plug is removed the glove box will open downward, twist it gently upwards to the right, the glove box will release from a plastic stud sticking out of the dash on the Left hand side. Remove the glove box. To reinstall reverse the order making sure you properly seat that plug, it may take a couple of tries as it must snap all the way in or it will be misaligned.

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post #2 of 7 (permalink) Old 08-21-2012, 08:26 AM
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I recently starting having problems with my gauge cluster and decided to check my wiring since it's been known that some issues with the cluster was a result of the worn through wiring of the BCM harness. Well yesterday I checked mine and sure enough the wires were not only visible but the bracket had cut through the insulation exposing bare wires. I shoved a piece of foam between the bracket and the harness which will prevent the problem from happening again.

To add to Judge's post, here are some photos from another site that shows exactly what Judge and I are talking about. In the first photo on the lower-right hand side you will see the clip that you will have to pull the glove box from as Jugde explained before you can remove it from the left side.







Everyone should check their's regardless of what year your GTO is. Even if you're not having any problems now you still should check 'em out before problems do occur.

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post #3 of 7 (permalink) Old 08-22-2012, 06:52 AM
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post #4 of 7 (permalink) Old 12-07-2012, 09:52 PM
 
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I just checked this on mine. 74K miles and I had just a hint of the chaffing. I wrapped it up just in case. I don't even want to know how much it would be to replace the BCM.

And my temp fix. I'll put hose over it later.

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Last edited by rtsoul; 12-07-2012 at 09:53 PM. Reason: Misspelling
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post #5 of 7 (permalink) Old 10-21-2013, 02:53 PM
 
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Originally Posted by rtsoul View Post
I just checked this on mine. 74K miles and I had just a hint of the chaffing. I wrapped it up just in case. I don't even want to know how much it would be to replace the BCM.

And my temp fix. I'll put hose over it later.
What size tubing do you think would fit over that? half inch or full 1 inch?
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post #6 of 7 (permalink) Old 10-21-2013, 03:02 PM
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Looks like maybe a piece of 3/4" heater hose would work good.
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post #7 of 7 (permalink) Old 02-05-2016, 09:36 PM
 
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bought my first gto today ill take a look at that tomorrow thanks for the heads up!
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