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Unread 02-20-2013, 09:45 AM   #1
Nate620
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Join Date: Feb 2013
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Battery issue

So I've got a 98 zj 4.0l that has a serious problem with some kind of battery draining issue. Somehow the battery has a constant draw on it and if I don't drive it often ( at least everyday) the battery will drain completely dead, it's killed the battery that was in it when I bought it and it has now killed a brand new battery in under 3 months... There is some kind of 'aftermarket' wiring in it for all the interior lights, if its off none of then work and I have to flip the switch to get them to work, everything else seems to be stock for wiring... I'm kind of stuck here with it and I don't feel like going threw 4 battery's a year, any idea what could be the problem? Thanks in advance.

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Unread 02-20-2013, 10:23 AM   #2
JS97ZJ
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1997 ZJ 
 
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Location: Dingmans Ferry, PA
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Pull fuse #7 in the JB (passenger kick panel). That fuse disconnects the BCM which controls the interior functions in the Jeep. Usually the courtesy time out feature will not totally fall asleep due to a bad rear ajar switch that has gone bad. The lights will go out, but the circuit will stay active causing a 180 ma draw which is normally 30 ma. This will be enough to kill your battery overnight.
It might be one of your door switches but you'll have to determine that through testing the draw with an amp meter.
1.png  
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Unread 02-20-2013, 10:35 AM   #3
JS97ZJ
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here is the diagram for the BCM
bcm1.png   bcm2.png   bcm3.png   bcm4.png   bcm5.png  

bcm6.png   bcm7.png   bcm8.png   bcm9.png   bcm10.png  

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Unread 02-20-2013, 10:37 AM   #4
JS97ZJ
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and here
bcm11.png   bcm12.png  
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Unread 02-20-2013, 10:42 AM   #5
Nate620
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I do have the sagging driver door problem, I took out the switch that if the door is open/closed ot lets you know because it would be shut and while driving the beeping noise would be going off, I'm at work right now but when I get home ill try that, thank you appreciate it

Edit - I'm a little looking at all those diagrams, actually have no idea what I'm looking at lol
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Unread 02-20-2013, 10:55 AM   #6
JS97ZJ
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Hang in there. We all have to start some where.
The door hinge pins can be replaced for cheap. (HELP cards in your local parts store)
Get that fixed before you end up with busted locks.
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Unread 02-20-2013, 11:16 AM   #7
Nate620
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I'll try pulling that fuse and see what happens... Will that fuse effect my dashboard/cluster lights?
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Unread 02-20-2013, 11:22 AM   #8
JS97ZJ
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yes! Disconnect it when you shut off the engine for any length of time.
It will also disarm the alarm system, but you'll find out if the drain is coming from that circuit and you'll get to use your Jeep in the morning.
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Unread 02-20-2013, 12:07 PM   #9
Nate620
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Yeah ill try it tonight, I was disconnectin my battery for a little but it ended up being too much of a pain in the *** to pop the good every morning, especially when living in New England but I'm going to try that fuse tonight
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