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Old 03-06-2005, 07:35 PM
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Join Date: Mar 2005
Posts: 2
300SD alarm possessed

Hey y'all
I'm new to this, so I ought to thank you in advance for your patience. I've a 300SD, and the alarm is misbehaving. It will turn on (sometimes, not always), when I turn on the lights! Locking/unlocking the doors does not work (I tried driver and passenger side).

any thoughts?


1985 300SD
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Old 03-06-2005, 10:49 PM
Aaron's Avatar
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,935
Best fix if you ask me?

Unplug the darn thing. If you remove the passenger side carpeting, you will find the alarm control unit underneath. There is a big, black plug that you'll see on the top of the control unit. Pull that plug, put a piece of electrical tape over it and be done with it. You can of course, begin diagnosing to see whether it is the control unit at fault (most likely) or a door switch. But I doubt the chances are high that your 300SD will be stolen nowadays.
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Old 03-07-2005, 01:44 PM
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Join Date: Mar 2005
Posts: 2
thanks for the help. I'm leaning that way myself. FWIW it seems to be behaving again. (I always check if the lights flash now that I can't hear the horn
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