1986 W201 Alarm malfunction - Need Help

[crhenkel]

My 1986 W201 190E 2.3-16v has the factory Alarm and it has started acting strange. I learned the hard way not to lock the doors by pushing down on the lock knob so I fixed the lock linkage and have been locking the doors with the key after the doors are all closed ever since. Recently, the alarm has started going off as soon as I lock the doors. The horn has been disconnected so I didnt realize this was happening until I locked the doors outside at night recently. I can see the headlamps flashing showing that the alarm is sounding. No matter which location I lock with all the doors closed, doors or trunk, the alarm triggers. If I push the lock knob on the passenger door down to the lock position with the door still open and close the door the alarm does not sound. Any ideas? I have a spare alarm module and will try swapping it tomorrow. SO....if I lock the car with the lock knob the alarm seems to not trigger, but if I use the key to lock the car in any lock cylinder, the alarm sounds and the lights flash. ANY ideas why and how to fix?