possible bad BCM? - JeepForum.com

 
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post #1 of 13 Old 05-17-2013, 11:56 PM Thread Starter
Muzramp
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possible bad BCM?

hi, today while driving, after i parked my jeep and turned it off, I noticed when I went to start the jeep, my Guages stop working, infinity amp stop working, power windows, locks, mirrors, stopped working and the dome lights dont go on when a door is opened, key fob doesn't work. I checked the fuses for everything I could find with BCM in it. all the fuses look good, I'm going to replace them anyways to see if that is the issue.

where is the BCM located so I could possibly grab one from a junk yard and replace it.
what do you guys think the issue may be?

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post #2 of 13 Old 05-18-2013, 12:10 AM
JohnCrabtree
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I'm curious as to what a BCM is? I've never heard of a BCM?

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post #3 of 13 Old 05-18-2013, 12:21 AM Thread Starter
Muzramp
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Body Control Module. :P also forgot to mention, I did check the wiring in the boot for driver door. The wiring is completely fine.
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post #4 of 13 Old 05-18-2013, 12:26 AM
MurdaJs
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Did you check your battery terminals?
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post #5 of 13 Old 05-18-2013, 04:04 AM Thread Starter
Muzramp
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yep, i even disconnected the terminals for a few minutes to reset.
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post #6 of 13 Old 05-18-2013, 04:41 AM
KoreaZJ
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Quote:
Originally Posted by JohnCrabtree View Post
I'm curious as to what a BCM is? I've never heard of a BCM?
BCM is used in 96-98 ZJ's. Our earlier ZJ's have many more discreet wires.

BODY CONTROL MODULE

"A Body Control Module (BCM) is used on this model to control and integrate many of the vehicle’s electrical functions and features. The BCM contains a central processing unit and interfaces with other modules in the vehicle on the Chrysler Collision Detection (CCD) data bus network. The CCD data bus network allows the sharing of sensor information. This helps to reduce wiring harness complexity, reduce internal controller hardware, and reduce component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities."
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post #7 of 13 Old 05-18-2013, 01:52 PM Thread Starter
Muzramp
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Well, I got a BCM from the junkyard. It still didn't fix the issue, anyone have any ideas?
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post #8 of 13 Old 05-18-2013, 03:29 PM
JohnCrabtree
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Quote:
Originally Posted by KoreaZJ

BCM is used in 96-98 ZJ's. Our earlier ZJ's have many more discreet wires.

BODY CONTROL MODULE

"A Body Control Module (BCM) is used on this model to control and integrate many of the vehicle’s electrical functions and features. The BCM contains a central processing unit and interfaces with other modules in the vehicle on the Chrysler Collision Detection (CCD) data bus network. The CCD data bus network allows the sharing of sensor information. This helps to reduce wiring harness complexity, reduce internal controller hardware, and reduce component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities."
Thanks for the explanation!

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post #9 of 13 Old 05-18-2013, 07:54 PM Thread Starter
Muzramp
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I bought new battery terminals, that didn't fix it. I'm assuming the BCM from the JY is bad itself, ordering a different from ebay. i'll let you know what happens.
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post #10 of 13 Old 05-18-2013, 09:00 PM
massarosareloud
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I'm not trying to hijack your thread muzramp, but it seems uncalled for to make a whole new thread for such a simple question. Where is the BCM? I couldn't find mine for the life of me, and I think some solder joints are going bad in it and would obviously like to reflow them.

Unfortunately I don't have a diagnosis for your problem, but I would start there. Maybe open up the old BCM and take a look around and see if anything seems amiss.

1996 Jeep Grand Cherokee Limited Edition 4.0L
3.55 axles, stock pretty much everything, except for a PSC steering gear and fuel injectors
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post #11 of 13 Old 05-18-2013, 10:48 PM
dnuccio
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clean the terminals on the battery. also wouldnt be a bad idea to go to an auto parts store and ask them to test the battery. might be bad.

Reliability is relative
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post #12 of 13 Old 05-19-2013, 04:39 AM Thread Starter
Muzramp
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Quote:
Originally Posted by massarosareloud View Post
I'm not trying to hijack your thread muzramp, but it seems uncalled for to make a whole new thread for such a simple question. Where is the BCM? I couldn't find mine for the life of me, and I think some solder joints are going bad in it and would obviously like to reflow them.

Unfortunately I don't have a diagnosis for your problem, but I would start there. Maybe open up the old BCM and take a look around and see if anything seems amiss.
It's located under the driver dash, right under the light switches. Take off the panel under the light switch, and there is a sheet of metal with 4 screws covering it, the bcm is not visible because it is behind it. Once you unscrew it disconnect the plugs going into it. Then slide it out it is a little tricky to wiggle out.
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post #13 of 13 Old 06-05-2013, 07:53 PM Thread Starter
Muzramp
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Turns out it was just a bad fuse; the big maxi fuse under the hood for power windows,locks and all that jazz. I guess I skipped that one when checking fuses... The PO had a 20 in there instead of a 50..
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