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 Post subject: BCM problem was really a bad ground.......
PostPosted: Wed Mar 13, 2019 8:22 pm 
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.....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

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 Post subject: Re: BCM problem was really a bad ground.......
PostPosted: Wed Mar 13, 2019 10:15 pm 
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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.

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 Post subject: Re: BCM problem was really a bad ground.......
PostPosted: Wed Mar 13, 2019 10:30 pm 
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So very glad that fixed it! :BANANA:
Now I hope you can get a refund for the BCM you bought? :juggle:

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 Post subject: Re: BCM problem was really a bad ground.......
PostPosted: Thu Mar 14, 2019 11:00 am 
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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.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle


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 Post subject: Re: BCM problem was really a bad ground.......
PostPosted: Thu Mar 14, 2019 11:26 pm 
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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...

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 Post subject: Re: BCM problem was really a bad ground.......
PostPosted: Fri Mar 15, 2019 3:47 am 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
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.

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 Post subject: Re: BCM problem was really a bad ground.......
PostPosted: Fri Mar 15, 2019 1:55 pm 
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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

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05 Jeep Liberty CRD Limited :JEEPIN:
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
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GM11 Bld.fan/HDClutch
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 Post subject: Re: BCM problem was really a bad ground.......
PostPosted: Sat Mar 16, 2019 12:34 pm 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
Not currently but I will try to get one today.

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'06 Lbrty Sprt CRD 150K

Sasquatch
DSS Turbo
CAT-elimntr
Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
head
cams
rockers
Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770


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