A few months ago the car alarm in my 1985 300D went off. I have no idea why the alarm went off, it has gone off before, but only very rarely. Well one day it went off when I opened the door. I opened the door with the key, and the door unlocked but when I opened the door the alarm went off.

In the past when the alarm has gone off (it happened once or twice before) it stopped once the door was shut then opened properly. Well it didn't work this time. I shut the door and locked it and it stopped, but once I unlocked the door and opened it again the alarm went off again.

I drove the car home with the alarm going off (people probably thought I was a some crazy guy with a siren) and when I got home I tried to turn it off, but couldn't turn it off. So I just removed the horn for the alarm. This worked fine for me other than the fact that the alarm locked up the trunk. The only way I can get into the trunk is through the emergency trunk release. It works alright for me, and hasn't bothered me too much, but I would like to fix it so I can get into my trunk easier.

So if anybody could help me by telling me how to turn off the alarm or disable it, it would be extremely helpful. If no one knows how to turn off the alarm does anyone know how to cut power to it or something?