Have you replaced your Body Control Module (BCM) - JeepForum.com
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post #1 of 19 Old 04-15-2011, 07:32 PM Thread Starter
Jeremy302
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Wj Have you replaced your Body Control Module (BCM)

I'm looking for anyone who as actually replaced their body control module in their WJ. I have '99 Laredo that has several electrical issues going on right now. I plan on hopefully fixing this myself for a whole lot less cash than taking it to the dealer or a repair shop. I did already take it to a repair shop to diagnose what was causing all of my issues so that I wasn't just through money and parts at it.

What issues did you have and did the BCM fix them?


Did you replace the BCM yourself? New or used? How long has it been working properly?

Did you have to take the BCM to a dealership to have any sort of programming done to it?

I haven't found much in terms of solid answers for this topic so hopefully we can clear things up for everyone's benefit.

Thanks in advance,
Jeremy

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post #2 of 19 Old 04-16-2011, 04:32 AM
montrose
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Wj bcm change

I have electrical issues, jeep dealer said to change the BCM, so i had them do it. only took them a couple of hours, but made no difference at all to the electrical issues. Very easy to change, but might not be worth the expense.
I have a 00 WJ 4.7ltr
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post #3 of 19 Old 04-16-2011, 06:06 AM
HVACNY
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Make sure your battery is working correctly and the terminals are real clean and tight.That is usually the source of most Jeep electrical issues.Try that first.

2000 Jeep Grand Cherokee 4.7 V8

2013 Jeep Grand Cherokee Overland 5.7 Hemi
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post #4 of 19 Old 04-16-2011, 02:48 PM Thread Starter
Jeremy302
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Update: I first went with the cheapest and easiest route, clean and tighten the battery terminals that HVACNY recommended and chaching, this fixed the electrical issues that most recently occurred. Amazing how something so simple caused so many things to go wrong all at once.

Unfortunately this doesn't answer the point of this original thread for cases where you actually do have to replace the BCM but at least this will give you more proof as to what you can do first. Thanks HVACNY for your suggestion.

Just so you can compare my electrical issues for this case to some that you may be having. Less than a week ago I was driving early in the morning while it was still pretty dark and suddenly several things hit the fan all at once. The dash lights went to full brightness (dimmer didn't do anything), the overhead console was nothing but "--" (blank) where the information values were supposed to be, the compass still worked though, the power windows quit working from all doors, the dome lights didn't worked when you opened the doors, the warning chime no longer chimed, the marker/corner lights didn't flash when unlocking or locking the doors with the remote. I think this is all that I noticed.

If anyone else would please share there experience with this to try and help others that would be appreciated.
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post #5 of 19 Old 07-19-2011, 05:49 PM
sirwankel
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I was told that on WJ's you just have to make sure the model number is the same. The VIN shouldn't be hard coded into them. I am having issues with all my turn signals constantly flashing. At first they would flash just the left, then the right maybe, all of them. do nothing, it was random, but now it just contant flash. I tried a new MFS and flasher module, but no dice. I just got a BCM in that is suppose to be the same model, but my first short attempt a finding it under the dash didn't go so well. Not sure how good that thing is hidden up there. I'm going to try and change it this weekend.
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post #6 of 19 Old 08-27-2011, 09:24 AM
gqmdl0617
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Quote:
Originally Posted by Jeremy302 View Post
Update: I first went with the cheapest and easiest route, clean and tighten the battery terminals that HVACNY recommended and chaching, this fixed the electrical issues that most recently occurred. Amazing how something so simple caused so many things to go wrong all at once.

Unfortunately this doesn't answer the point of this original thread for cases where you actually do have to replace the BCM but at least this will give you more proof as to what you can do first. Thanks HVACNY for your suggestion.

Just so you can compare my electrical issues for this case to some that you may be having. Less than a week ago I was driving early in the morning while it was still pretty dark and suddenly several things hit the fan all at once. The dash lights went to full brightness (dimmer didn't do anything), the overhead console was nothing but "--" (blank) where the information values were supposed to be, the compass still worked though, the power windows quit working from all doors, the dome lights didn't worked when you opened the doors, the warning chime no longer chimed, the marker/corner lights didn't flash when unlocking or locking the doors with the remote. I think this is all that I noticed.

If anyone else would please share there experience with this to try and help others that would be appreciated.
Did you ever figure out what the issue was with your Jeep? Im having the exact same problems right now.

White 2000 Grand Cherokee Laredo: 2" Fat Bobs BDS Springs with Bilstein 5100's, Addco sway bar, Black on Black heated leather, full limited wood grain, RB1, Mopar Ipod kit, 1000w of Kicker bass, 500w of lighting, Gen III projectors/5000K HIDs, Smoked full LED tails, 100w Whelen PA/Electric Air Horn with speaker mounted behind grill, Interior LED upgrade, 120v AC in the front and the back, Midland CB, PR-106 digital trunking scanner, yada yada yada. Just another WJ
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post #7 of 19 Old 08-27-2011, 10:11 AM
wsar10
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FWIW, I just went through alot of BS that REALLY seemed like my BCM, guages lights no start....

And it was my batt terminals, and they are relativley new along with the batt.

https://www.jeepforum.com/forum/f310/...issue-1255654/

do you have a FSM ?

QUOTE=billzcat1;wsar10 is right on point on this oil thread - as usual. Anyone reading this would be well-served taking his advice.


-03 WJ laredo 4.0 120k a few minor mods
-93 XJ 5spd, 3" zone lift
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post #8 of 19 Old 06-26-2017, 02:45 PM
JohnnyBertone
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Having the same exact issue did you ever resolve it? I'm 150 miles into a 400 mile trip
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post #9 of 19 Old 02-21-2018, 02:18 PM
CraigS72
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i too have the same issues,windows wont work,power door locks wont work,gauges wont work,,no info on the overhead console center, yesterday i took the fuse box from under the dash on the drivers side,,the BCM is located on the back of it..i only done so to get the model number and whatever else off it so i can match it up to order a new one..once i retightend every thing,all the things that wasnt working was working again..however,i knew not to get my hopes up cause thats just my luck..today i went out and started it to leave and nothing worked again..smfh..
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post #10 of 19 Old 11-18-2019, 07:23 PM
Kenmando
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Jeep electrical

Has anyone got a concrete answer to any of these issues. My battery terminals are clean and tight. I have a 2000 Jeep Grand Cherokee Laredo. I was a tech for gm until about 1988 and was good at my job but at that time gm did not have bcm modules. Everything was working perfectly and then when I started the Jeep one day none of the gauges or tach worked and I think all of the idiot lights came on, Ck gauges, Ck engine etc....also the power windows would not work. I am sure other stuff wasnít functioning but those I am sure of. Engine starts and runs fine. First thought was who could be fkn stupid enough to design a car in a way that could lead to some serious stuff like not being able to roll up the windows if it started raining. From my experience as a tech I know that there has to be a common denominator in all these failed systems and the only thing I can conclude is that it has to be the bcm. Has anyone had something close to the same issues, replaced the bcm with a rebuilt or remanufactured unit and had it resolve their problems. It is truly the only logical assumption. Possibly a bad ground but then the system would not function correctly for 5 to10 seconds and then go bad. Any insight would be helpful. Thanks
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post #11 of 19 Old 11-19-2019, 09:55 AM
Mattyjm
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First, check for broken wires in the black boot between the driver door and door jamb. Also, try resetting your PCM and see if your problems go away.
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post #12 of 19 Old 11-24-2019, 05:13 PM
Kenmando
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Tried resetting the pcm and it only last about 15 or 20 seconds then abs light comes on, tach drops to 0, then fuel guage quits working and then everything else starts crapping out and all the idiot lights come on. If I just turn the ignition on and donít start the Jeep everything stays working correctly. Cleaned the battery terminals which looked great and everything worked good for that day and then I didnít drive it for approx 5 days and now everything is bad again. Electronic components wear out over time so I guess the bcm could be coming and going. Jeep runs great even with the problems itís having. Does anyone have a real answer to this issue because I havenít read one yet or even a logical cause. Broken wires in the door should be a constant issue and the thing will change all by itself without the vehicle being driven. Voltage drop on startup causing the bcm to drop out? sounds crazy. Batteries are meant to start vehicles only and then alt takes over. Makes no sense at all. Replaced tail lamp lenses a couple of weeks ago and fixed the issues with the tail lamps and find it hard to believe that they could cause this issue because I donít hit the brakes while Iím checking for the problem so there should be no voltage going to tail lamps to throw bcm out of wack if that is even possible. In this system does the battery function as some type of capacitor and even if you have plenty of voltage to start the vehicle and even after the alt should be fulfilling voltage requirements it can still leave low voltage somewhere in the system? Fn bs
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post #13 of 19 Old 12-14-2019, 08:46 PM
feaman85
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Knemando, Im working on a 99 grand cherokee with no problems with key on but 5 seconds after starting gauges drop down, cluster lights up and power windows go inop. Im blaming BCM. Cleaned and tightend grounds and batt terminals with no change. Going to order a flashed BCM most likely.
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post #14 of 19 Old 12-15-2019, 11:52 AM
Kenmando
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feaman85 typed a long response with my situation and once again the jeep forum locked up my computer and I lost it all. call me at 813 382 3926 and I can discuss this with you. I am having the exact same problem you are having and may be onto something but wont know until I go out to work on jeep in a little while. you are the only person who has mentioned the exact same scenario as my jeep. keep me posted one way or the other and i will do the same. email or calling would probably be best because I don't want to type another 45 minute response and then lose it. thanks, ken. forum wont let me post my email until I make 5 posts and I have only made 3
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post #15 of 19 Old 12-16-2019, 01:25 AM
JoMc67
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For the Love of God, Ken...Get yourself a Remanufactured BCM and see what happens.
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