XJ XJ8 / XJR ( X308 ) 1997 - 2003

01 XJR Battery dead, keys won't open trunk

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Old 11-23-2012, 11:58 AM
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Exclamation 01 XJR Battery dead, keys won't open trunk

Hi, tried to review the posts for a solution but my car only has the 2 holes that hold the license plate on. Anyone have a pic or diagram where I can see where to jump it from under the hood or any other solution would be helpful!
 
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Old 11-23-2012, 12:18 PM
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There's a positive terminal on drivers side of the engine covered with a rubber cap. Jump leads from a 12v source, positive lead to this terminal, negative lead to good earth, chassis is best. If it doesn't work first time, look for a better earth connection.
 
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Old 11-23-2012, 12:28 PM
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Arrow

Going to give this a shot now!
 
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Old 11-23-2012, 12:59 PM
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Default Back seat fuse boxes

You can also jump it at fuse boxes under
back seat. The large black wire is POSITIVE and ground to brackets.
 
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Old 11-23-2012, 01:18 PM
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Didn't seem to work
 
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Old 11-23-2012, 01:20 PM
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Going to try this next. Thanks Kenncl
 
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Old 11-24-2012, 04:16 PM
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Default Positive Post and Key Hole

Probably a silly post, but I'm guessing the 1999 and 2001 are different in this respect? I've actually got a keyhole on the left of the XJR Emblem for the trunk.




And just for future, here is the Positive Post under the hood. I use this to connect a battery charger for my RC Airplanes and Heli's.


 
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Old 11-24-2012, 04:31 PM
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SuperSport,

does your car have CATS suspension?
 
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Old 11-24-2012, 04:50 PM
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Originally Posted by ianclements
SuperSport,

does your car have CATS suspension?
I always believed it did, but I don't see any wires leading to the suspension, so likely not???
 
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Old 11-24-2012, 08:14 PM
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If the underhood post does not work, you have some problem besides low battery. It is the positive lead. The chassis is the negative lead. Jumping there is exact;y like being on the battery.
 
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Old 11-25-2012, 08:25 AM
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Default Got it

Thanks to everyone for the help! Found the terminal and tried jumping it again. With a GOOD ground it roared to life. Next problem... ran it for 10 minutes then turned it off for 30 seconds hit the key again and it started running thru the diagnostics and died. Any ideas? Cables look new
 
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Old 11-25-2012, 08:27 AM
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Thanks Dinger, worked with a GOOD ground!
 
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Old 11-25-2012, 08:32 AM
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Thanks SS, I'll keep that in mind for my car and boat! btw key slot is the same it's just all 3 of my keys would go in and turn it but not open it! Popped immediately with motor running!
 
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Old 11-25-2012, 09:48 AM
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The valet key, likely green, should not work in the trunk. The others should. If they don't, the lock is either broken, or your keys were all copied from the valet key.
 
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Old 11-25-2012, 09:58 AM
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My guess would be bad cable connection or bad battery, at least to start with since it'seasy to check. Even if the cables look good, I'd remove and clean them, then try to charge battery and see if that helps.
 
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Old 11-25-2012, 10:09 AM
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Originally Posted by Porsche407
Thanks to everyone for the help! Found the terminal and tried jumping it again. With a GOOD ground it roared to life. Next problem... ran it for 10 minutes then turned it off for 30 seconds hit the key again and it started running thru the diagnostics and died. Any ideas? Cables look new
Charge and test the battery is a good start. Is the car's charging sytem working? BTW the license plate holes that you needed should be under a nice piece of what seems like black tape. They are where the lower license plate screws would screw into if it had them. Hard to see. You have to poke through the tape or peel it off. At least that's where my '98 VDP had them.
 
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Old 11-25-2012, 01:30 PM
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Super Sport, there should be a black, cone-shaped
cap over the shock towers if you had CATS. also
little wires running out. Maybe a previous owner
made the switch over to normal shocks.

Congrats on winning a hood liner!

Ian
 
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Old 11-25-2012, 03:35 PM
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Originally Posted by ianclements
Super Sport, there should be a black, cone-shaped
cap over the shock towers if you had CATS. also
little wires running out. Maybe a previous owner
made the switch over to normal shocks.

Congrats on winning a hood liner!

Ian
Yeah, I'm excited about the hood liner, and no, I don't have those on my shocks.
 
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Old 11-25-2012, 05:45 PM
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As your battery was completely dead, the computers will have to re-learn everything, so get her running again, with preferably a NEW battery and go for a 30 minute drive, all should be good after that. These cars are particularly sensitive to partially discharged batteries and can throw up all sorts of error codes so just get a new battery and all should be good.
 
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Old 11-25-2012, 06:05 PM
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Originally Posted by SuperSport
Yeah, I'm excited about the hood liner, and no, I don't have those on my shocks.
You'll be posting some pics then?
 
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