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Unread 05-12-2008, 10:19 AM   #1
purple_jeep
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Current draw from Body control module

Hi all,

I've being having trouble with my jeep, it would die after a couple of days of not driving it. So on the weekend i took some time to discover what was wrong. After some carefull investigation i discovered that the body control module is drawing upwards of 150mA when the jeep is off...

Can anyone suggest a reason for this? Do i need to replace the BCM? Is it repairable (I am an electrical engineer).

Suggestions?

Cheers

Chris

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Unread 05-12-2008, 10:29 AM   #2
WJChris
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Please add your Jeep info so we can help you better. I think this will work for you.. http://www.jeepforum.com/forum/profile.php?do=extra

IOD circuit??? Normal???

http://www.wjjeeps.com/fuses.htm#DRAW
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Unread 05-12-2008, 10:38 AM   #3
WJChris
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Another thought... while measuring the current, start pulling fuses to narrow it to a specific circuit the BCM controls, unless you already have.
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Unread 05-12-2008, 11:46 AM   #4
Colorado 5.9
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Since we don't know what year you have I'll post this anyway.

http://home.sc.rr.com/janet/TSB/08-09-96.htm

http://home.sc.rr.com/janet/TSB/08-16-96.htm

http://home.sc.rr.com/janet/TSB/08-41-95.htm
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Unread 05-12-2008, 12:11 PM   #5
purple_jeep
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whoops sorry guys I have a 1998 Jeep Grand Cherokee Larado 4L

I narrowed it down to the fuse that supplies the BCM the power amplifier and the dashboard stuff.

After unplugging the supply connector to the BCM module located under the drivers dash the current dropped down nothing.

Chris

Last edited by purple_jeep; 05-12-2008 at 06:15 PM..
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Unread 05-12-2008, 12:55 PM   #6
WJChris
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Quote:
Originally Posted by purple_jeep View Post
whoops sorry guys I have a 19998 Jeep Grand Cherokee Larado 4L

Chris

HAHAH!! That HELPS!!! 1999 or 1998??? LOL!
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Unread 05-12-2008, 12:57 PM   #7
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from links provided and good info:

Normal ignition off draw is less than 25 milliamperes. This condition will prevent the Body Control Module from powering down which occurs approximately 30 seconds after the ignition switch is turned off. The Body Control Module draws approximately 180 milliamperes when it is in the normal operating mode.
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Unread 05-12-2008, 11:07 PM   #8
purple_jeep
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sorry about the typo, its a 1998 I have also placed it in m profile.

That memo does seem to report the same problem as what i am experiancing except the memo specifies the 1996 model of the jeep. Is this problem one that can exist on all years jeeps?

Anyone know where i can get a new/rebuilt BCM or is my only option second hand off ebay?

Cheers

Chris
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Unread 02-07-2011, 07:27 AM   #9
BackBrakeBilly
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I am experiencing this same exact problem!
I am going to check the BCM out today and see whats up with it...
Any advice on this will be greatly appreciated!

Thanks!
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Unread 02-07-2011, 08:59 AM   #10
tcar
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Quote:
Originally Posted by purple_jeep View Post
That memo does seem to report the same problem as what i am experiancing except the memo specifies the 1996 model of the jeep. Is this problem one that can exist on all years jeeps?
Chris
96-98 GC's are identical for almost all purposes (ZJ-2).
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Unread 02-08-2011, 04:51 PM   #11
BackBrakeBilly
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I replaced the BCM in my Jeep today and the short is still there...
I can still remove the white connector and the short goes away or as before remove the #7 fuse and the short goes away...
I need a good wiring diagram for the wires that come out of the BCM through that white connector...Anyone???

Thank you...
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Unread 08-14-2011, 04:33 PM   #12
98GCLim40
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Did you ever figure out what was the problem?
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Unread 08-14-2011, 10:27 PM   #13
JS97ZJ
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Quote:
Originally Posted by 98GCLim40 View Post
Did you ever figure out what was the problem?
It was the flip glass ajar switch..

http://www.jeepforum.com/forum/f13/b...night-1161645/
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