The warning relay lives behind the instrument cluster. As others have indicated, it buzzes for a number of reasons. It is possible to wire around the seat belt switch and eliminate that annoyance without damaging anything else. Someone on this forum reported that it is possible to open up the relay, remove the buzzer and substitute [external to the relay] the chime warning that some GM cars have.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

hmm. I think I may leave well enough alone or replace it with another module.

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

... or simply connect the two wires leading into the seat-belt receptacle so that it thinks your seatbelt is buckled.

But as always, wear your seatbelt (disclaimer).

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Gone to the dark side

- Jeff

My W124 is quiet if I have my seat belt on. No sounds at all during glow. With the seat belt off it does buzz though.

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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

http://www.fuelly.com/sig-us/40601.png

"Zomeone" must have "Fixed" mine, previously.
I get No "Puddle Lights" either when I open the driver's door.
(Heck no lights at all)
I' ve always assumed the Seat Belt Buzzer Relay behind the I.C. was bad ,
AND one day it would go on the "List" of repair-ables.

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'84 300SD sold
124.128