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Old 06-16-2014, 01:18 AM   #1
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Jeep Liberty Battery drains

Just wondering if anyone may have had the same problem with their Jeep. I have a 2007 Jeep Liberty 4x4 Limited; purchased used, came equipped with base plate and wired for Roadmaster Even Brake.
Problem is, if I let the Jeep sit for 4 or 5 days the battery goes dead. Did some trouble shooting today and found that the BCM (Body Control Module) circuit is the one draining the battery. The BCM and this circuit appears to control the radio, interior lights, dashboard, and power door locks. I don't think the BCM is bad since things seem to operate like they should, but still something on this line is drawing power. One odd symptom thou; when I hook up the battery charger, the rear door locks or it tries to with what little battery there is. I disconnected the power connection for the locking solenoid for that rear door but that wasn't the cause of the power drain.

Anyone experience anything similar? Any suggestions as to where the problem may be? Or should I just pull out the wallet and prepare to buy a new BCM??
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Old 06-16-2014, 03:33 PM   #2
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I have a 2012 Jeep Liberty. I don't have experience with the BCM. But, is the BCM on it's own fuse, or are the systems you mentioned on their own separate fuses? If the latter, I would disconnect all the fuses and see if it stops the problem. If so, I would test each fused system separately to see which one has the problem. Good luck!
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Old 06-16-2014, 07:40 PM   #3
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All of these sub-systems are on the same fuse. What I don't know is if the BCM controls the power to each of subsystem via relays, or if each sub-system powered directly off this one fuse. Since its only a 10-Amp fuse I am leaning toward separate relays energized by the BCM.
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Old 06-16-2014, 09:40 PM   #4
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If the BCM is a plug-in module, it might be worth it to replace it and see if it helps. I'm wondering if one of the mods made by a previous owner tapped into one of the circuits, and made a short thst drains the battery.
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Old 08-25-2014, 03:12 PM   #5
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I am hooking up the Even Brake on my 2005 liberty now and in the instructions it says to hook it up to a switched fuse so it doesn't have power all the time. The problem is there are only 6 fuses and they are critical fuses (ABS, A/C clutch, Injectors, starter relay, HBL and fuel pump) and I sure don't want to hook it up to any of these. I am an I/E technician so if I figure it out I will let you know what I come up with.
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Old 08-25-2014, 05:09 PM   #6
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Our '07 Wrangler would drain the battery after a day on the road.

I ended up installing a blade switch on the negative battery post so I could disconnect it for towing. As the brake system I was using at the time required a 12v receptacle I rewired one of the two on the dash to pull power through the tow harness. After that I never had another problem - and no, you don't have to reprogram the radio each time.
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