I have been toying with the idea of killing the buzzer ever since owning the car. It's very annoying. But I didn't particularly like any of the options offered. The main way everyone does it, is to remove the relay, open it up and kill some random part of the inside, snip something, de-solder a component, and put it back in. This seems to work great, but It doesn't seem like the safest way to electrically do this, IMO. Plus you lose the other somewhat valuable features of the relay (headlights left on, and dome light with delay).

The second way I found is to cut a wire or two at the seatbelt receiver, but apparently this triggers an SRS light. Which can apparently be remedied by putting a resistor inline. I don't really wanna mess with my SRS system for obvious safety reasons. And this only kills the seatbelt buzzer, not the key left in ignition buzzer.

So credits go to MBworld user Floobydust, for this find. He mentioned not seeing it anywhere else, and he was correct. Infact, I forgot to bookmark his post initially and it took me a few weeks to find it again.

I just did this and it took me all of 15 minutes. All you have to do is remove the instrument cluster. Unplug the buzzer connector, pop it open, remove the green and red/green wires, cut them tape them, whatever. Plug it back in. And now you have no more ignition/seatbelt buzzer, but the headlight buzzer and dome light still functions!

Credit for floobydust for the pic below as well:

__________________
http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

Sounds awesome and very simple! Will do when I get my car back (after I find a new engine)

John...is the buzzer the little black box below the bigger black box with the two wire sets going into each side? I had my cluster out but not sure how to unplug the buzzer connector. I couldn't see any green and red/green wires. Only green and yellow/green.

Thanks,

Steve

By pushing the driver's seat all the way forward, I was able to access a brown and green wire underneath back of the seat with a white connector. Pulled that apart and no more buzzer when starting car! It's so quiet it throws me off sometimes

just curious if anyone knows why my seatbelt buzzer works but not the headlight or key in ignition buzzer works?

__________________
93 300E 2.8 - The Beezy
05 Mazda3 Hatch - The Zoom

http://www.fuelly.com/smallsig-us/66774.png
http://www.fuelly.com/smallsig-us/24183.png

After I unplugged my seatbelt buzzer, my light buzzer, door buzzer, and key buzzer still work. Maybe someone messed with the buzzer box behind the dash or cut some lines?

there is also another method ... when i get in the car, i hold the red seatbelt release button with my left hand and start the car so I don't hear the buzzer .... I have done it so many times i have mastered the time needed to keep holding down the seatbelt button release to not hear the buzzer ... i never timed it, but I would say at least 10 to 15 seconds

__________________
1994 E320, 145,000 miles

I did this procedure and it worked perfectly. Thank you.

__________________
1990 300E
124.030
chassis 103.983