Have been having problems with my alarm and door lock system not activating properly from my fob for quite some time now w. my '94 4.0 coupe. I was reading on an earlier thread tonight about how the problem is usually a low fob battery. I took mine apart and checked it (an A23), and it only had about 1/4 voltage left in it. No wonder it was malfunctioning. I tossed the battery, put the fob back together, and started to head to the store for a new one. However, when I went to open my driver's door, the alarm went off (even though it was nor armed beforehand or the doors locked). It has been going nonstop. I tried turning the key to Position 1 in the ignition nine times, like I have done on some of my other Jags, and the alarm still won't shut off. I can't disconnect the car battery, b/c I can't find my tool kit, on top of this.

HELPPPPPP!!!!

 

Use the valet key. Turn the key 3x- slowly - to the start position. Don't start the Jag. If you ever get the boot open, check the security system fuses. I have a 93 XJS coupe. Same issues years ago. Removed the entire security system. Got too expensive buying batteries. Fob, now, is of no use. Everything is manual.

 

Lol at batteries getting expensive. Just get a new battery for the fob and add a quick release to your NEG terminal on your car battery for future convenience