The alarm on my 88 300E stayed on today after I opened the door (with the original key). It wouldn't go off even after I locked and unlocked the doors and after I turned the car on and drove home. All the way (about 20 minutes) the car kept honking the horn and flashing the lights. It would stop for a few seconds and then back on again. When I got home I had to disconnect the battery to shut it up. Is there a way to disconnect the alarm and still keep all other functions of the car intact? I heard somewhere about a couple of wires under the passenger's seat carpet. I disconnected those and the alarm didn't stop.