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Old 02-08-2011, 09:25 AM
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TJ immobilser wont disarm!

Hi Guys, have a really irritating problem. I parked the HEEP last night, tried to start this morning but the key fob will not disarm immobilizer. The sentry light on the dash still stays on no matter how many times I push the unlock button or how close I hold the Key Fob. Tried replacing the batteries but no luck either. It has done this once before but worked again after much cursing and waiting on the side of the road. The vehicle is a RHD UK spec, built in 97 but sold in 98.

I had a problem with the main battery going flat a couple of weeks ago, so fitted a new one. There was no problem after that until now???

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Old 02-08-2011, 12:04 PM   #2
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You may have something else installed or it is an export item. In the US the SKIM system does not have a fob. There is a chip in the key that deactivates the system.

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Old 02-08-2011, 01:57 PM   #3
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As Neil stated, it might be different because your vehicle is foriegn.. but..

Does the key for the vehicle has a grey plastic head? If so, then it has a transponder antitheft system. If it is black, then it does not have this.

Does the vehicle even attempt to crank?
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Old 02-09-2011, 06:35 AM
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Thanks for the response. The key is black, the key fobs are the standard chrysler ones with 2 buttons - similar I think to the Cherokee ones. Engine will not crank. If I push start it will start and run for a very short time then cut out again.
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Old 02-09-2011, 06:39 AM
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I had to tow it into the dealer this morning, but the guys there are not familiar with working Jeeps, they have a yard full of nice shiney ones that only see paved roads.
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Old 02-09-2011, 08:28 AM   #6
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Have the same problem here. Only does it when left outside overnight in bitter cold, like when under 5 degrees or so. I've tried everything except replacing the skim. Dealer has no ideas either as they cannot "replicate the problem." The only thing that works for me is parking in the garage. I feel your pain!
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Old 02-09-2011, 11:03 AM   #7
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Unless the keys are also different color for export, he does not have the Chrysler SKIM system. In the US the keys with the transponder chip are gray. Again, there is no Chrysler fob activated system in the US.
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Old 02-09-2011, 12:51 PM   #8
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Something to do with cold Temps . I had a new car that the battery would go dead in the garage over two or three days . It was summer and real hot . The garage would get very hot in the day time expand the metal and turn the interior lights on ? It had alot on interior lights and we never did fix it . It would only do this if the temp got over 96/97 so we park it out side under a tree on hot days
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Old 02-09-2011, 07:51 PM   #9
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If I were you guys, I'd remove those. I have a 97 wrangler that HAD the immobilizer and it started acting up... I changed the battery in the fob and it was a good temp fix.... untill one morning at 2AM when I got off work and went to disarm it and it wouldn't. After much investigation, I had to have it towed to the dealer only to find that the module had shorted out. I had that thing removed.

They gave it to me afterwards and its a simple plug and play thing. You could remove it yourself.
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Old 02-10-2011, 08:21 AM
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Thanks guys for all your ideas, as the Heep is my daily driver I had no option but to take it to the only dealer in the country. They interrogated the ecu and identified an open circuit in the immobilser, removed and fixed it too, the keys needed to be re-coded too.

They were also so very helpful in "finding" a fuse missing and fitting a new one (at a premium of course) - Yes the one that was missing is the damned door chime fuse!! Anyway at least it now runs, cant use the seatbelt anymore for some reason but I can drive it! $150 later.

Am onto the original immobiliser suppliers too. I want the damn thing outa my vehicle!!
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Old 04-10-2011, 04:27 PM   #11
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Hi I have a Jeep Wrangler 1998 (UK). Even after changing the batteries in the key fob (black) the immobiliser is not turning off. How easy is it to take the immobiliser off and how? Can I do it myself?
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Old 07-09-2011, 12:21 PM   #12
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Here is my question, if you can just take out the immobilizer, and you jeep will run, how does it really prevent theft, can't they just do that too?

Edit: the reason I ask is I'm in southern California, where jeeps love to cross the border and never come back!
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Old 03-06-2013, 04:00 PM   #13
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Need help! Just bought a 97 TJ Wrangler, 4L. Brought it home & replaced the battery. That is when the problem started....
It starts for abt 3 secs and then switches off. Spoke to the authorised dealer and they showed me another Wrangler with identical problem. They have no idea how to sort it out. The keys are not chipped and it has 3 button remote.
How can i remove or even reset or disable the immobiliser.

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