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Jeep ZJ electric issues
#2310057
05/23/17 11:04 PM
05/23/17 11:04 PM
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Joined: Jan 2003
Posts: 5,385 Pikes Peak Country
TC@HP2
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,385
Pikes Peak Country
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1998 Grand Cherokee Limited, got a few issues that may be inter-related but need to tips on trouble shooting.
First issue I noticed was the interior lights would not turn off after shutting down the vehicle. They turn off when its started, return to being on where turned off and stay on after locking the vehicle. Some basic trouble shooting leads me to believe its may be the body module, but could be an issue with the light switch.
To avoid draining the battery while chasing this, I took out all the bulbs. A week later go out to work on it and battery is dead. Charge it back up, install and start checking draw. I find a .4 amp draw on the 50 amp mux/tow circuit which, unfortunately, is the circuit for nearly every power accessory in the darn vehicle. So, I've got something draawing power within some accessory. Also within this circuit are two door control modules, that interface with the body module, which makes me wonder if there is a relationship to this issue and the interior lights.
Looking for Suggestions on ways to continue testing in an effort to isolate without simply replacing parts.
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Re: Jeep ZJ electric issues
[Re: indcontrols]
#2311093
05/25/17 06:43 PM
05/25/17 06:43 PM
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Joined: Jan 2003
Posts: 2,719 541 slobovia
A990
master
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master
Joined: Jan 2003
Posts: 2,719
541 slobovia
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I am assuming that you have a moonroof - that's where the trouble starts on these - there are holes in the front and back of the moonroof drive channels, the front ones have little hoses that run through the A pillars and down the firewall, the back ones go down and exit behind the taillights... These little holes and hoses (likely less than 5/16) get clogged up and water seeps down the A pillar and starts affecting the electronics... The cleanout procedure is an air pistol (not at full pressure), and much frustration... Most every one of these I have encountered has a myriad of different problems, lights, ABS, etc. etc. If you don't have a moonroof, please disregard .. lol I had good luck with weedeater string, hope this helps. Modern electrical is crazy complicated when it goes wrong. Good Luck!
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