'99 XJ, stock

My guess is an aftermarket alarm, to which we have to key fob to turn it off with.

Disconnected battery for about a minute. Connected it and flashers are going on/off. Get in to start, turn the key and all i get are the dummy lights and the radio and odometer blinking at me in unison with the flashers. Get out and the doors automatically locking themselves (which they didn't do before).

I know nothing about alarms. I looked under the dash to at least try and see what brand it is, no joy. Any help would be greatly appreciated.

Thanks,

Butch