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Location of backup battery for 93-94 security module?

XJ40 ( XJ81 ) 1986 - 1994

Location of backup battery for 93-94 security module?

 
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Old 07-03-2018, 11:14 PM
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Question Location of backup battery for 93-94 security module?

Does anyone know where the backup battery for the security system is located in a 1994 XJ12/XJ6?

.
 
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Old 07-05-2018, 08:35 PM
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Originally Posted by al_roethlisberger View Post
Does anyone know where the backup battery for the security system is located in a 1994 XJ12/XJ6?
I don't know of a backup battery - if the security system has a keep-alive-memory, it may be powered by one or more capacitors built into the ECU.

I assume the system is similar to the one used on the '93 cars - you can see the schematic on pdf page 86:

Jaguar XJ40 Electrical Guide - 1993-1994

I don't recall a backup battery on the X300 security system either, but I may be wrong.

Cheers,

Don


 
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Old 07-06-2018, 06:50 PM
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This may be applicable. I'll have to look around under the dash to see if so:

https://forums.jag-lovers.com/t/xj40...ystem/250896/3


I found the alarm system back up battery today when I was fixing the
drivers side (UK) blower. It is completely dead - zero volts - and needs
replacing.
Am I right in assuming that replacing this will enable me to disconnect
the main battery without having to re-program the alarm each time?
Yep, thats correct, is the battery 0.5 Ah ?
I could’nt source on in the UK, but you may be able to tape a 1Ah battery in
place, lasts twice as long. I bought a charger for mine, as the main battery
is out of the car over the winter, so I also remove the back up, discharge
it and recharge it, keeps it healthy
.
 
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Old 07-06-2018, 09:43 PM
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That's an interesting thread, Al. Have you looked up the TSBs that Bob Gauff mentioned? I wonder if they might mention this elusive battery?

I thought it was interesting that highhopes said, "As far as I know nobody has ever seen the back-up battery on a '94
XJ40." I will be very curious to hear what you eventually learn on this topic.

Cheers,

Don
 
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Old 07-07-2018, 11:42 AM
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Looking at the electrical service manual, I don't see any mention of a backup battery either, so *shrug*

Isn't it interesting that the "Security ECU" has a connection to the antenna? I wonder if this is the radio antenna, or the in-car phone antenna, or?

 
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Old 07-07-2018, 03:28 PM
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Originally Posted by al_roethlisberger View Post
Isn't it interesting that the "Security ECU" has a connection to the antenna? I wonder if this is the radio antenna, or the in-car phone antenna, or?
I think this is one of the antennas in the backlight/rear windshield glass, but I don't know if it is shared with either the phone or radio.
 
 
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