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Old 08-13-2019, 08:02 PM   #1
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Rear door wiring harness corroded. How can I change that?

So I came back from the shop and they basically told me that the wiring harness was corroded, and it explains why the window won't move, and the door won't lock. How do I change that? Can I just buy the part aftermarket, attach the wires to the old wires, and be done with it? Where do I purchase this type of part?



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Old 08-13-2019, 08:04 PM   #2
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https: //imgur.com/a/WRom2Kn

here is the related picture of said cable

Last edited by TheAcct; 08-13-2019 at 08:06 PM.
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Old 08-13-2019, 08:11 PM   #3
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Unusual that the harness suffers from what you describe; what part of the harness is the problem? Is it inside the door or somewhere else. If its in the door, go to a salvage yard and take the harness from another vehicle, that is the least expensive and easiest way to repair the problem. You can inspect the harness in the door to see if it suffers from the same concern as your current one.
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Old 08-13-2019, 08:14 PM   #4
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That's the cable originating from the car, but the door cable seems also to have this issue. That door was actually entirely repaired 2 years ago, insurance tells me that this issue is unrelated to the repair, and i'm in the process with them trying to make them pay...

I posted the picture as a reply to my OP of the cable.

Last edited by TheAcct; 08-13-2019 at 08:17 PM.
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Old 08-14-2019, 12:20 PM   #5
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That is almost certainly a waterproofing problem.

It may not need replacement, depending on how bad it is inside the connector there. You may be able to salvage the wiring with some careful cleaning. A mildly acidic cleaning solution will remove the corrosion from the metal, say a vinegar solution. Once you have clean metal, apply dielectric grease to the connectors. I would then look to seal the connector, which is probably where the failure was. A thin smear of silicone around the connector once it's working will work to keep moisture out of the connector, and prevent the problem from coming back. You may be able to remove the terminals from the plastic connector piece and clean them individually. This will give the best results, but just soaking them in the cleaning solution will probably work well.

If there's a bigger problem, like a door seal or weather strip that should be keeping water away from there in the first place, then that will also need to be addressed, but my guess is that the body shop had the connector apart, probably to remove the door and damaged the weather seal slightly, allowing a small dribble of moisture into the electrical connector. A very tiny imperfection in the connector seal could do that.
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