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BCM problem was really a bad ground.......
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=89804		 Page 1 of 1
Author:  warp2diesel [ Wed Mar 13, 2019 8:22 pm ]
Post subject:  BCM problem was really a bad ground.......
.....under the driver's side headlight.
Symptoms
1) No Headlights.
2) No Fog lamps.
3) No Horn I had to drive home at night with only parking lights.
4) Transmission shifted strange lots of torque converter slip and tach was at 2400 RPM at 50MPH.
5) Engine lost a lot of its' response and was doggy.

Acted like a bad BCM, but electrical problems can be like some Politicians, they lie to you.

A fellow CRD owner pointed out some problems with '06 CRDs.
1) Bad ground on upper driver's side fire wall. Mine was OK.
2) Messed up wiring harness where it goes behind the fuel filter mounting bracket. mine was OK.
3) Bad ground under the driver's headlight. That was the problem.

Image

Image

I could not get the nut off the grounding stud under the headlight so, I broke the eyelets off and ran the grounds up to the battery.
I painted on liquid electrical tape onto the butt crimp connectors to seal them up.
Problems solved
Author:  WolverineFW [ Wed Mar 13, 2019 10:15 pm ]
Post subject:  Re: BCM problem was really a bad ground.......
I caught that ground point rubbing on something before I had problems while changing my battery one day. I think it has bad factory routing. Everyone needs to check this as a maintenance item.

Sent from my SM-G965W using Tapatalk
Author:  WWDiesel [ Wed Mar 13, 2019 10:30 pm ]
Post subject:  Re: BCM problem was really a bad ground.......
So very glad that fixed it! :BANANA:
Now I hope you can get a refund for the BCM you bought? :juggle:
Author:  warp2diesel [ Thu Mar 14, 2019 11:00 am ]
Post subject:  Re: BCM problem was really a bad ground.......
After going through the pain of trying to find a used BCM, before finding the bad ground, I found a place that rebuilds your ECM,TCM, BCM, or PTCM, and not wipe out the flash to work with your Jeep. Unlike some other places that just wipe off a salvage unit with WD-40, claim to test and ship it.
Here is their link: https://moduleexperts.com/modules/jeep-bcm-repair/
After I found the bad ground, they were professional and let me back out of having my BCM repaired. They also appreciated it when I let them know how the bad ground will make the BCM act crazy incase they repair a BCM and the problem persists.

IMHO, we should have a Sticky for places that repair ECM, TCM,BCM, and PTCM units.
Author:  DieselJeepLuvr [ Thu Mar 14, 2019 11:26 pm ]
Post subject:  Re: BCM problem was really a bad ground.......
warp2diesel wrote:
After going through the pain of trying to find a used BCM, before finding the bad ground, I found a place that rebuilds your ECM,TCM, BCM, or PTCM, and not wipe out the flash to work with your Jeep. Unlike some other places that just wipe off a salvage unit with WD-40, claim to test and ship it.
Here is their link: https://moduleexperts.com/modules/jeep-bcm-repair/
After I found the bad ground, they were professional and let me back out of having my BCM repaired. They also appreciated it when I let them know how the bad ground will make the BCM act crazy incase they repair a BCM and the problem persists.

IMHO, we should have a Sticky for places that repair ECM, TCM,BCM, and PTCM units.


Good info here. Hell I never even knew these had a BCM...
Author:  GordnadoCRD [ Fri Mar 15, 2019 3:47 am ]
Post subject:  Re: BCM problem was really a bad ground.......
There is another one on the inner fender well to the rear of the tire, appx below the brake master cylinder. It's a pretty cluttered area so it's not very noticeable.

I agree all body ground points should be addressed as maintenance issues at least every other year, and probably every year in areas of high precipitation / road salt use / coastal beach areas / other corrosive environments.
Author:  WWDiesel [ Fri Mar 15, 2019 1:55 pm ]
Post subject:  Re: BCM problem was really a bad ground.......
GordnadoCRD wrote:
There is another one on the inner fender well to the rear of the tire, appx below the brake master cylinder. It's a pretty cluttered area so it's not very noticeable.
I agree all body ground points should be addressed as maintenance issues at least every other year, and probably every year in areas of high precipitation / road salt use / coastal beach areas / other corrosive environments.

Gordo, do you by any chance have a picture of the ground so we can add it to the library?

Image
Author:  GordnadoCRD [ Sat Mar 16, 2019 12:34 pm ]
Post subject:  Re: BCM problem was really a bad ground.......
Not currently but I will try to get one today.
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