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Jaguar XJ-Series Electrical Glitches

71 messages,  Last post on Nov 29, 2009 at 6:10 PM

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What is this discussion about? Jaguar XJ-Series, Jaguar XJR, Sedan

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#22 of 71 Re: 1990 XJ6 Blowers [donj38618] by kennybee Aug 21, 2008 (6:19 pm)
Replying to: donj38618 (Dec 15, 2007 8:23 pm) don PLEASE tell me that you found the (an) answer to this problem with the blowers. I have the exact problem just as you described it and as a result I have no a/c in my 1990 Jaguar xj6. Local dealer is no help and wants a fortune to just diagnose the problem.
#23 of 71 Re: Faulty computer? [rekrab] by monkamah Aug 22, 2008 (8:13 am)
Replying to: rekrab (Apr 26, 2007 11:56 am) I am having the same problems w/ my 2000 XJ8. Did you ever get this resolved? Mine has been in the shop for 3 wks now, in and out...mostly in. I started out just trying to get the module fixed in the rt rear door so the window would work. What a nightmare this has been.   My problems are: 1. The ignition switch does not activate . 2. Seat does not automatically adjust to set position when car is cranked. 3. Doors lock and then immediately unlock when the plunger is pressed. To lock doors, it is necessary to use the key or the FOB.   This guy only has a few hours left before I hang him from the highest tree. Thanks for you help. Replies to this message: kbeerden (Aug 22, 2008 8:49 am) deadjag (Aug 22, 2008 9:11 am) monkamah (Aug 22, 2008 11:44 am)
#24 of 71 Re: Faulty computer? [monkamah] by kbeerden Aug 22, 2008 (8:49 am)
Replying to: monkamah (Aug 22, 2008 8:13 am) Hi I did work out my problems, I change the front right door module. This module is the main brain for all of those items. Was a bit costly, over $300.00, easy to change. Make sure you get one with the right code the dealer can not reprogram the module. The code can be found on a sticker under the trunk matt on thr lift side, it will start with DDM ######## and don't buy a use one I tried that and just wasted money. Hope this works out sounds like the same problems I was having
#25 of 71 Re: Faulty computer? [monkamah] by deadjag Aug 22, 2008 (9:11 am)
Replying to: monkamah (Aug 22, 2008 8:13 am) My problem turned out to be a bad battery which I replaced. I had tested the battery voltage which was OK but the amperage was not enough to turn the starter. (IThe battery was original equipment so I should have known!) In the process of finding this out someone told me how to reset the computer. Don't know if this would help you but apparently if you remove the black (negative) connection strap from the battery for 10 minutes, then reconnect, it will reset the computer. Good luck. Replies to this message: monkamah (Aug 22, 2008 11:44 am)
#26 of 71 Re: Faulty computer? [deadjag] by monkamah Aug 22, 2008 (11:44 am)
Replying to: deadjag (Aug 22, 2008 9:11 am) Just replaced a module in the back rt rear door and I'm moduled out! Sheesh! If I do it is it a tough job?   Will the battery cause everything to go fritz on the car...? 1) doors won't lock when pushed down 2) interior lights stayed on 3) seat won't set properly 4) **and it won't start...   Also, mechanic replaced the back door module w/ a used part that he swore would work. This guys been there for 26 years and I thought he might know what he was talking about.   Thanks, guys...I'm about to lose my rosy disposition over this.
#27 of 71 Starting Problem: '92 XJ6 by gene37 Sep 11, 2008 (7:40 pm)
Four years ago, had a starting problem on this one. Would not start unless starting amps were topped out with a booster. Soln: cleaned oil from ignition module, replaced coil and distributor. No problem last four years.   Now, same problem again. Cleaning module did not solve problem this time. Questi on:::: should I replace the module??? coil??? other???   Other info: Starter turns over engine briskly. "Occasionally" I can get it star†ed by topping out the battery charge, and putting a battery booster on it, about 1 in 4 attempts. Runs great once started. (Until next attempt to start). Comments appreciated.
#28 of 71 XJ8L GEM module? by scottthorn Oct 26, 2008 (8:03 pm)
I have a 1998 XJ8L and love the way it looks - I just wish I could drive it. It won't start. My mechanic (not a Jag expert, but honest and good with cars generally) has been trying to figure it out, and is close to concluding the GEM module needs to be replaced at a Jaguar dealer, with a likely cost in the THOUSANDS of dollars. I only paid $6,500 for the car a year ago.   When I said it won't start - everything lights up when the ignition is switched on, but when I turn the key all the way, nothing happens. I mean nothing. No sound at all, no engine turning over, no starter sounds, not even any clicking of relays. Absolute silence. Is it the GEM? Will it cost thousands of dollars? Can't we just cross a wire somewhere and bypass all this electronic crap? Replies to this message: goodkitty (Aug 06, 2009 7:51 am) LotusExige4me (Aug 06, 2009 6:58 pm) scottthorn (Aug 11, 2009 5:26 pm)
#29 of 71 XJ8 Starting Problem by deadjag Oct 27, 2008 (5:56 am)
Mine is a 99 XJ8. My starting problem turned out to be the battery. I had tested it with a meter and it had about 12 volts so I moved onto other problems, wasting time and money. Problem was that, although the voltage was OK, the amperage wasn't enough to crank the starter. If you have an original Jaguar battery (white color) and it's more than 3-4 years old, it's probably shot. Another possibility is the computer needs to be reset which can be done by removing the + battery strap for 15 minutes then reconnecting it. Good luck.   Deadjag Replies to this message: Mr_Shiftright (Oct 27, 2008 7:53 am) scottthorn (Oct 27, 2008 8:16 pm) donaldyngly (Dec 31, 2008 6:38 pm)
#30 of 71 Re: XJ8 Starting Problem [deadjag] by Mr_Shiftright HOST Oct 27, 2008 (7:53 am)
Replying to: deadjag (Oct 27, 2008 5:56 am) Good advice. Unless you "load test" a battery, just measuring voltage at rest doesn't tell you much about it's condition. And that's true, most batteries are pretty tired after 4 years of use. Some go longer but on average 4-5 years is plenty for optimum performance.
#31 of 71 Re: XJ8 Starting Problem [deadjag] by scottthorn Oct 27, 2008 (8:16 pm)
Replying to: deadjag (Oct 27, 2008 5:56 am) Thanks to both you and Mr. Shiftright for the responses. The battery had died back in February. That was weird. The engine would turn over and over, but never start. We thought maybe it was a fuel pump problem! But it was just the weak battery. Replaced it and everything was fine. For a while after that, I would try to start it and nothing would happen. Then I could switch it off, immediately try it again, and it would start right up. Or sometimes I would have to turn the key off and on two or three times before it would finally crank. That's what made me think it was some sort of simple relay switch problem. Obviously, the last time it happened, turning it off and on didn't work after trying it 20-30 times.   It will be interesting to try disconnecting the battery though and let the computer reset. Thanks for that one.

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