factory alarm
 

my 89 420sel came with an alarm system.It has a seperate horn which seems to be under the batery holder. The problem is the prier owner installed a keyless entry with its own alarm consisting of a siren which was working fine until today. I started the car this morning and the factory alarm [horn] went off for no aparent reason the only way to stop it was to find the fuse in the fuse box and remove it. The problem is that fuse also controls the door locking system and other things. Is there a wire i can remove or a relay to completly dissable the old system.

The control unit is under the passenger's feet. Pull back the carpet and the black panel.

IF this happens again, just insert the key in the door and turn to lock and then unlock...

THANKS DONNIE I WILL TRY IT TOMORROW.