If that doesn't work, then there's something wrong with your alarm. I really don't know a whole lot more about the alarm system, only what I can see in the parts diagram. There's two control units, a switch, a horn, and a bunch of sensors. I don't know how the sensors operate.

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino