Is there a way to completely disable the alarm on a 96 XJS convertible? The manual says there is a switch or something in front of the counsel but I don't see one. I'd like to remove it or cut the wires to it or pull a relay or fuse but I don't know where it is or if there is a specific fuse or relay.

 

On earlier models you could just unplug the big white connector behind the rear right tail light. But why would you.... Its also the remote doors.

 

That info is for the V 12 an earlier car. My 96 6 cyl is different. I really need to get that alarm turned off or removed. They are a nuisance as no one pays any attention to them. Any help would be appreciated.

 

The late V12 models share the same security module with the AJ16 models. And to answer your question, yes you can pull the 7.5 fuse in the trunk fuse compartment, but all this will do is leave you without keyless entry. You can’t “remove” the security/keyless module completely because the ECU in the car communicates with it in order to get the car started. The Fridgette security modules found in these cars don’t really go bad. I know because I’ve handled several of them.

Is the alarm randomly going of? What is prompting you to want to get the system removed? If all you want to do is turn the alarm features of, you would have to add a valet switch up front under the console and perpetually leave the car in valet mode. This way, you don’t loose the keyless entry features but leave the alarm features disabled.

 

As I understand it, if the valet switch isn't installed on the centre console (at the front under the armrest lid?), then the 2-wire plug is underneath the centre console storage insert. You remove that and the wiring connection should be there. (Something from memory makes me think it has a purple / pink wire?)

Good luck

Paul

 

It’s yellow and black

 

I'll check that out. Thanks

 

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You can always just unplug the siren and remove it.

 

It’s yellow and black.

I‘ve got a 1995 XJS and I can’t shut off the alarm, except by disconnecting the battery.

Tried severing the yellow and black under the console, but alarm is still connected.

Also tried removing the 7.5 fuse under passenger side dash and that doesn’t work either.

Any new ideas would be most welcome.

 

Update:

I found the fuse box in the right rear trunk and pulled the 7.5 fuse and no alarm! Whew! Was thinking problem solved, but then went to start car and no power! So I replaced the 7.5 fuse and the car started! But then the alarm returns, so I pulled the fuse and the car kept running with no alarm. Amazing.

I can’t begin to figure out how to solve this. Any thoughts are greatly appreciated.

 

Segler56,

You need to look through your wiring diagram to understand the security system.

You'll see that the 7.5a fuse is a control input to the security module. You'll also see that there is a starter inhibit output from that ecu. That starter inhibit output seems to be an input to the transmission rotary switch, which itself is a control element that would preclude the car from starting. However, once the car had started, you could disable that circuit and obviously the car would keep running.

So, it seems that pulling the fuse will disable the alarm but also affect the starter inhibit circuit.

You really need to work out why the alarm is going off.

It seems to me from looking at the circuit diagrams that the easiest thing would be to disconnect the output wires from the security ecu to the alarm sounder. Then you'll seem to still maintain the locking circuits, starter inhibit etc but the alarm won't sound if it triggers.

Good luck

Paul

 

Paul,

Thank you the excellent counsel. I’ll work on this today. I just shipped my XJS from the US to France and I’m encountering problems I’ve never experienced in 10 years with her. As for the cause of the alarm, I’m struggling to understand it. I unlocked the driver door with an original key, as I’ve done a thousand times and it set off the alarm. In the past, the fob or turning the key in the driver side door would stop it. Well, the fobs stopped working a few years ago and my Jaguar dealer said they can’t replace them. Turning key in the door numerous times failed to stop the alarm, as did turning the key 3 times in the ignition, as was suggested in this thread.

BTW, I couldn’t put the convertible top up either without the 7.5a fuse.

I will work on disconnecting output wires from security ecu to the alarm sounder this morning.

 

Here’s the latest: I downloaded the Anti-Theft wiring diagram and identified the yellow-gray and orange wires that activate the sounder device. Photos below:

 

Next I severed these two wires. The alarm still sounds. I know I’m close to solving this, but there‘s another step required apparently. Paul or anyone else, thoughts please?

 

Hmm,

I can't see how that's possible?

Perhaps just go to the sounder and disconnect feed wires there? You haven't got an additional aftermarket alarm fitted as well have you?

Also, looking through the wiring diagram, I can't see how the hood won't go up with that fuse disconnected? I'll have another look!

Cheers

Paul

 

Hi Paul,

No, have no additional sounder, after market or otherwise. I can’t get under her to sever wires directly to the sounder, but I have an appointment with a local mechanic on Wednesday, so we can get underneath her.

I started thinking, maybe cut the wire to the Start Inhibit, but I still would have the alarm problem.

Thanks for your excellent advice.

Cheers!

 

Here is my 2cts worth. STOP just cutting wires........
1st stupid question.... It very strange that both remotes don't work. But did you replace the battery and ( i think on '96 too) reprogram them to the alarm ?
As Paul said, it seems to be connected to the cars computers and just cutting wires seems a bad idea. The alarm sound is not the whole problem.

2nd.... My suggestion would be that as its a US car and uses a 318 Mhz system, I would buy a a second hand 434 mhz alarm unit from a European '95 '96 and replace the old unit and remotes.

 

Agree with Malc, you need to establish why the alarm is going off. It's perhaps going off, because the car thinks the alarm has been set by the fob but not unlocked by the fob.

Also, ime, the only things that go wrong with the fobs are either losing their connection after batteries fail, which requires a quick re-programme, or else the plastic hinge piece of the button snapping which can be fairly easily fixed.

You need to get the fobs working properly,as disconnecting the sounder is just a temporary fix. Also agree with not cutting wires, disconnect them properly from plugs or components. Definitely don't disconnect the wire from the inhibit switch for now, as I'm not sure if it works on a "positive" or "negative" basis and you may disable the car. Check the wiring diagram.

Good luck

Paul

 

Yes, I did replace the car battery a couple years ago. I also went into the dealer in Alexandria, VA 6 months ago to ask about getting the fobs working again and was told I needed to replace the batteries in the remotes. I did that and, nothing. This may address the basic problem, disarming the alarm rather than disabling it. I’ll now get educated on re-programming the remotes.

Thanks for the wise counsel, especially you Paul