How to disconnect alarm on s type jag? When trying to start car the alarm starts and kills the engine

You probably had your alarm set when you took out the old one. Just unlock your doors with your key fob, then disconnect the battery again for a few minutes and let it reset with the alarm off.

if the alarm is sounding the common prob. is the pos. battery supply missing from the fem,[ front electric module] located lh lower A post brown/red wire i think. it sets the security system off after you have locked the car, it thinks the battery has been disconnected. the most likely cause is a corroded open circuit wire around the front bumper/lh wheel arch liner area. the power comes from i think the engine bay fuse box, the other option could be a faulty door or trunk/hood latch

i'd take to a jag specialist as they will know the exact alarm jaguar used on your model as they use a lot of other make equipment and you do need to know jags to get the right part for the particular vehicle, you could try a jaguer forum as these places are full of info like that

I don't think crank sensor has something to do with it unless the engine lights turns on and scanned were done and found the crank sensor code spits out... now you stated the alarm kept going off, question for you is the alarm a factory or aftermarket? if factory you are talking about maybe the anti theft triggered the " kill switch " to prevent from starting... what you can do is find the relay of the alarm module disconnected and try starting the car..

Try unplugging battery for 15 minutes to reset immob then retry.

If the engine will start, and the car is drivable, find the alarm and disconnect it until such time as you can get to a repair shop. If disconnecting the alarm kills the engine, then use a jumper wire to bypass it. If the car won't start because of the security system, I'm afraid you will have to have it towed to a dealership or repair facility to disarm it.

Sounds like an issue with the car's immobiliser. In order to prevent theft by disconnecting the alarm system when the power is cut the immobiliser is programmed to interrupt the car restart when power resumed. You will need to reset the alarm code.

Removing the battery cable is something the alarm companies no the theifs can do. Find the valet button, this along with a few steps that you can find with your alarm manual will reset the system.

Hi Keith

Probably those little Jag gremlins at it again ?

First thing to do is clear the computers memory, which normally does the trick.

Disconnect both battery terminals, switch on the ignition to start 6 times, this wipes the computer memory, and then reconnect the battery, the Positive + first......... then the Negative -----

Start the car and go from there.

Suspect you had a low battery previously, and this tripped the warning.

Get the battery checked, if it is the original, as it is now 8yrs old, and should be replaced.


Good Luck !

A FixYa rating would be appreciated Thank you !

John.

Glad to be of service. The graciousness of a FIxYa rating would be most appreciated.