Last post on Nov 07, 2013 at 9:41 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
What is this discussion about?
Jeep Grand Cherokee, Electrical, SUV
#705 of 735 Re: HERE IS WHAT I WENT THRU TOOK ME 3 DAYS [jpflum]
May 13, 2013 (1:57 pm)
Sounds similar to my problem:
I have a 1999 Jeep Grand Cherokee 4.0 liter/6 cylinder that has 164 K miles. I've kept it in pretty good shape with tons of new parts over the past 3 years or so, and don't want to part with it. However, lately it's been getting horrible gas mileage (about 10 MPG highway), has been running roughly, and smells bad.
Finally took it to the dealer after several attempts by my local, independent shop. Dealer said that the car has been dripping oil down onto the ECU wiring harness for so long that the oil corroded the wires and harness plugs/sockets to the point that they are un-repairable. He said this harness is no longer made, and even if I could find one in a junk yard, it would be "pure luck" to be able to use it and have it work.
His solution? Buy a new car, mine wasn't worth fixing. Would cost several thousand dollars, more than the car is worth.
Actually, the guy sounded sincere, like he really was trying to save me a ton of money and hassle on a difficult problem that did not have much chance of success.
But what do YOU think? Can motor oil really corrode wires and sockets, or just gum them up? Can't this thing just be cleaned really good with an electronics degreaser spray?
Any tips appreciated...
#706 of 735 Re: HERE IS WHAT I WENT THRU TOOK ME 3 DAYS [bretm]
May 13, 2013 (4:18 pm)
I would do research at parts stores and online parts sources, i can't believe you can't order a new wiring harness, sounds like the dealer service guy earns a referral fee if you buy a new jeep thats bigger than his fee for fixing, plus if there is a harness it will be cheaper to replace at an independent shop. Does not sound like a valid answer. If you want to try cleaning, get some electronic contact cleaner spray, take connectors off ecm computer located under hood on firewall passenger side, spray connectors and put back on, then unhook any sensors you can can reach on engine and spray connectors, look for pins on connectors that are pushed back and push them back in, make sure they lock in place. If you see any ground wires under hood that ground to body or firewall, take them off and sand the paint off where they mount to body, spray ground lugs with the contact cleaner. This could fix a lot of issues, i have a 99 grand cherokee laredo 4x4 with 172,000. I doubt its this, but battery gage if you have one on dash should read higher than 13.5 volts, if its lower, replace battery if its been a while, weak battery will not let computer function properly, i had this in past. Loosen battery cables and clean posts and terminals with wire brush if corroded, spray some contact cleaner there also. I would not clean harness itself if it has oil on it, its not a factor, bunch of bs, but connector contacts can have poor connection due to corrosion due to age, and can be cleaned as i explained. If none of this cheap stuff works, find a good independent mechanic that specializes in electrical and computers, he should be able to get a harness if needed, but could be a sensor, make sure the mechanic shop has the proper computer diagnostics equipment for jeep. It would not surprise me if just cleaning connections fixes. Let me know if you fixed.
#707 of 735 Re: HERE IS WHAT I WENT THRU TOOK ME 3 DAYS [barryz]
May 15, 2013 (11:06 am)
Thanks for your thoughtful, detailed reply! I'll give these suggestions a shot and find out...
#708 of 735 Re: ONE CATASTROPHE AFTER ANOTHER #2 [karma90]
May 20, 2013 (4:24 pm)
I had this exact same problem with my 97 jeep grand Cherokee. Driving down the rd it would just shut off. Is your check engine light on? Mine was on, and I thought it was my alternator too. I felt kinda silly when m mechanic tightened the serpentine belt and replaced the battery. I never had a problem again. My check engine light, which was on for years, has been off ever since. Hope this helps.
#709 of 735 2001 Grand Cherokee alarm and door problem
Jun 12, 2013 (3:04 pm)
I'm experiencing 2 problems that have surfaced at the same time. Thus, I believe they are connected.
When driving, my overhead monitor chimes, illuminates the interior lights and says "Left Rear Door Open". Of course it is not, but it keeps coming on and going off.
Also, now my alarm keeps going off intermittently (and ohh to often). Haven't had a good night's sleep in a while.
I've taken it to the dealer, who said I needed a new rear left door latch, but would no guarantee that would fix the problem. Latch replaced, problem persist.
I'm at a loss for what to do next. Does anyone know what the cause could be, or a solution?
#710 of 735 Re: 2001 Grand Cherokee alarm and door problem [dmagi]
Jun 12, 2013 (7:14 pm)
I HAVE A 1997 JEEP GRAND CHEROKEE LAREDO. I EXPERIENCED THE SAME ISSUE A FEW MONTHS AGO. IF YOUR ALARM IS CONNECTED TO YOUR POWER LOCKS, THEN IT MOST LIKELY MEANS THAT YOUR REAR DOOR LOCK NEEDS TO BE REPLACED. FOR ME IT WAS MY PASSENGER DOOR. AFTER IT WAS REPLACED, I HAD NO PROBLEM WITH THAT ISSUE.
HOPE THIS HELPS.
#711 of 735 Re: 2001 Grand Cherokee alarm and door problem [dmagi]
Jun 12, 2013 (8:33 pm)
A very common failure that can cause all kind of power lock, alarm, power window, and interior light issues is that inside the drivers door, in the wiring harness that runs in door from the power lock/window harness is that there is a big, thick, copper back ground wire that grounds windows, locks, alarm, interior lights, to a body ground. this wiring harness passes thru door into car thru a grommet in forward side of door. If you can loosen the interior panel of door low by hinged side you will see this harness, and where it exits door. The common problem is this big fat black ground wire is not so much twisted wires but a round solid piece of copper, and repeated opening and closing of door have caused it to snap in 2 just inside the door or on the outside where it passes into vehicle. I could not visually see the break till i stuck my hand under the loosened interior panel and felt around this biggest fattest wire. i found it was broken in 2, but still making contact with a tiny corner which did not provide a large enough ground path. I was able to very gently strip the insulation of each side of the broken wire and use a twist on wire terminal to join the 2 pieces together, all problems fixed. Its been 2 years now, no more problems. I think if you take to a mechanic to fix, most not so honest, will replace a motor, lock, switch, charge you for parts and labor and repair the ground wire without telling you that was problem, as its only about 30 minutes labor, so the real cause is kept from you so you will thank them for fixing things that weren't broken and were much more profitable for them.
#712 of 735 Part with three month backlog????
Jun 22, 2013 (3:46 pm)
I am new to this board so if this has been discussed before, I apologize. My stepson has a 2008 GC. He went out one morning and it wouldn't start. He did all of the normal stuff to eliminate a dead battery or a fault in the electrical circuit with no result. A little later he tried again and it did start. That was the last time it did so. My question, however, is this; he had it towed to the dealer and they diagnosed it as the CWX on-board computer. Here's the kicker, they said that this part is not only back-ordered, the parts center indicated that there were 80 people ahead of him and it could take MONTHS before they received one for his vehicle. The service advisor advised him that they themselves had a customer who had been waiting since April. Has anyone heard of this situation? It seems surreal to me that it could be true.
#713 of 735 Re: 2001 Grand Cherokee alarm and door problem [karma90]
Jun 22, 2013 (10:15 pm)
The door latch was replaced.
The alarm hasn't been going off, but console still reads "Left Rear Door Open" and the interior lights stay on when I drive.
This is driving me crazy. Still haven't found a mechanic who knows what the problem is.
#714 of 735 Re: 2001 Grand Cherokee alarm and door problem [barryz]
Jun 24, 2013 (8:45 pm)
I had this electrical problem (power windows, interior lights, heater/a/c reversed) with my WJ and followed your advise. You Sir, are a genius. One broken thick black wire. I replaced it and my WJ is fully functioning again. Thanks for the money saved replacing things.