I have figured out from the forums that the part number indicated is the alarm control module. It is still connected as originally installed from the factory, but I just noticed a persistent ticking noise coming from the box.

Ticking happens whether the key is in the ignition or not.

Any idea what's going on with this piece? If I simply disconnect the connector, I would assume the ticking would go away, but do I need this box? What functionality do I lose by disconnecting the box?

Part Number stuff on box:
000 820 52 26
BAW 840 Z 0008

I have disconnected the alarm box on my 87 300D and my 87 300SDL without any adverse effects. The door switches were bad on both cars which required me to unlock the car from the trunk (which I forgot to do on a regular basis - nothing like a car alarm going off at 5am to upset the neighbors)

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Chris Young

Current cars:
1978 240D 4-spd manual 99k miles
1987 300TD - 132k miles
1987 300SDL - 280k miles.
1996 Subaru Outback - 132k miles
2003 Chevy Silverado Duramax/Allison - 195k miles

"My wife thinks I have a disease..... I think I have just inhaled too much diesel exhaust .... My neighbors think, well, who cares what the neighbors think"

Where else (besides the Dealer) can Alarm Module be bought ?

000 820 52 26

I've done the same thing. Nothing to make you look more suspicious in a hs/univ parking lot than attempting to get into a Mercedes whose alarm won't stop.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

Thanks, that worked for me.....

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1985 300D Turbo CA Fed 223K

What year and model are we talking about?

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Sam

84 300SD 350K+ miles ( Blue Belle )