[Car Angel]

I have a 97 LeSabre that occasionally out of the blue would start honking and blinking lights. After disabling the battery for about 15 minutes it would seem to reset itself. Now the honking and blinking lights start when I try to use the lock button in the car, when I start the car and when I turn the car off. If I manually lock each door I don't have the problem. But the lights stay on permanently regardless unless I disable the battery each time I turn the car off. Any ideas of what would cause all of these things to go balistic at the same time? Thanks!