I know that for my 560SL, I pulled the fuse for the central locking system and that stopped the alarm. I left it out for a couple of weeks and when I put it back in, the problem was gone.

Of course, you have to unlock each door individually when you pull the fuse.

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