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Old 04-05-2015, 08:27 PM
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Unhappy hello all major electrical problems>>>>>

So to start I'm new here so hello to all. Glad to meet some new jeep lovers.

Here is what I got. 2012 overland 3.6l 4x4. It was a flood vehicle and fortunately for me I changed the oil and fluids and its mechanically perfect. (thank god lol). But..... its got electrical problems as you would imagine. I have pulled these codes u0141 lost comm with bum. u0101 lost comm with tcm. Now it runs drives and shift perfect to I would think the ecm would be good since last I remember the tcm in integrated to it or so it is on our 05' limited. Here is the problem I can see or problems for that matter. 1 Drivers side turn signal stuck on. 2 no lock or unlock from door panels or key fob. 3. Nothing from gauge cluster. 4 3 windows don't work but I can hear them click all but passenger front which makes no noise. 4 Only front passenger seat functions. 5 Radio doesn't turn on but sounds like its internals are running even when jeep is off. 6 Battery draining

Yes something serious. Tried check all main harnesses and cleaning. Got blower motor to turn on by wiggling harness in pass foot well. In was thinking the famous tpim or ignition switch module.. any thoughts?

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Old 04-05-2015, 09:53 PM
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Re: hello all major electrical problems>>>>>

My guess is you're in for a world of hurt. I'm sure you have quite a basket of issues there. Do you have an automotive electrical technician in the family?
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Old 04-05-2015, 10:01 PM
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Re: hello all major electrical problems>>>>>

Nope sure don't. but I can't imagine its that bad. I could replace every module for under $3k mopar is cheap compared to the BMW I had. I assume the door modules/motors for windows are needing cleaned and I can test those directly but I imagine there has to be a mutual harness that handles the locks etc. The gauges did work when the auction was posting pictures so I would like to think spending $500 for a diag at the stealer should be able to give me a good direction. Tough part is the vehicle is too new to where people haven't posted these issues since most are under warranty or just out.
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Old 04-10-2015, 09:23 AM
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Re: hello all major electrical problems>>>>>

On flood vehicles it is very hard to just say "yup here is the problem and the solution is xxx"
The water has got into every location that was not supposed to be wet. The longer it was under water the worse your problems will be.
Where you have to start before doing ANY kind of diagnosis is clean clean clean. By this I mean everything has to come out of the interior so you can access all the modules and the connectors. All connectors will need to be cleaned dried and sprayed with WD40 or a comparable product. Then do this for all under the hood connections and all the connectors in the door cavities that were under water and are not designed to be wet. Connectors under the vehicle or on the outside that will normally get wet are not so important. Your focus should be the connections that plug into the control modules.
You will then need to hunt down all ground points to the body that were under water remove clean and spray with a sealant to keep moisture out. You will also need / should use dielectric grease on the connectors to help resist corrosion later on.
I asked how long it had been under water because all wiring will act like a wick and suck up water if given a chance. If that has happened you will have trouble down the road with wires getting corroded and messing with communication on the can bus and between modules.
After you do your extensive cleaning plug everything back in and reconnect your battery (you did disconnect it before you started right) and get it started again, run your scan tool and clear all codes. Then shut it down and start it again and let run up to normal operating temperature and then run the scan tool and see what it says. There could be modules that are bad but they could be just fine and not getting a good connection or ground.
There is not much you can do to a module other than take it out and make sure it is dry and has no water in it ... most are sealed well enough to withstand a little water.
I have done many flood car rebuilds and they are a lot of work to be sure but done right (and a little luck) they can be a good investment.
Good luck
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Old 04-10-2015, 12:17 PM
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Re: hello all major electrical problems>>>>>

Quote:
Originally Posted by leslie.thompson.7528 View Post
On flood vehicles it is very hard to just say "yup here is the problem and the solution is xxx"
The water has got into every location that was not supposed to be wet. The longer it was under water the worse your problems will be.
Where you have to start before doing ANY kind of diagnosis is clean clean clean. By this I mean everything has to come out of the interior so you can access all the modules and the connectors. All connectors will need to be cleaned dried and sprayed with WD40 or a comparable product. Then do this for all under the hood connections and all the connectors in the door cavities that were under water and are not designed to be wet. Connectors under the vehicle or on the outside that will normally get wet are not so important. Your focus should be the connections that plug into the control modules.
You will then need to hunt down all ground points to the body that were under water remove clean and spray with a sealant to keep moisture out. You will also need / should use dielectric grease on the connectors to help resist corrosion later on.
I asked how long it had been under water because all wiring will act like a wick and suck up water if given a chance. If that has happened you will have trouble down the road with wires getting corroded and messing with communication on the can bus and between modules.
After you do your extensive cleaning plug everything back in and reconnect your battery (you did disconnect it before you started right) and get it started again, run your scan tool and clear all codes. Then shut it down and start it again and let run up to normal operating temperature and then run the scan tool and see what it says. There could be modules that are bad but they could be just fine and not getting a good connection or ground.
There is not much you can do to a module other than take it out and make sure it is dry and has no water in it ... most are sealed well enough to withstand a little water.
I have done many flood car rebuilds and they are a lot of work to be sure but done right (and a little luck) they can be a good investment.
Good luck


Thank you for your thorough response. I have complete my gutted the interior including dash and cleaned all harnesses and connectors. Even ran a dehumidifier for 3 days inside to pull any moisture out. Keep in mind this flood happened May 1st 2014 so it sat since then. Even after all the work I did there has been no change. I'm fairly confident the issue is in the tipm module as the headlight switch for example only has .3volts coming into it and obviously doesn't turn the lights on However if I lock it with key fob lights turn on. I think the major problem is no power is getting I the cabin except for fuel door popper windows pass seat and climate control
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Old 04-10-2015, 09:32 PM
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Re: hello all major electrical problems>>>>>

Ok cool, so you have troubleshooting to do. You would best to try and come up with a flow chart for the electrical system if there is one available.
This is where experience and familiarity with the system will come into play but if you are patient you can learn it as you go. If you have a dealer tech you feel comfortable with then their help will be very valuable.
Just because the scan tool says module xx is throwing an error done not mean it is the culprit, it could be getting bad info set to it and making it unhappy. As you have said you are going in the right direction, but you definitely want to begin at the start and trace the route the problem takes.
As far as the headlight switch goes, I do not believe sees 12v at the switch like the systems of old. All the components for the most part just send a activate deactivate signal to a module. This helps to keep 12v load to a minimum in the passenger compartment.
Just some ideas from a old mechanic
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