For some reason, the horn on my 240D doesn't work at all. When the steering wheel button is pressed, nothing happens at all. No click, nothing.

I have checked and confirmed that the actual horn is still there (behind the front bumper) and all wiring appears to be in very good shape. Tried two different steering wheels and contact rings, no change. Fuse is also fine, and other things associated with the fuse work perfectly.

I noticed one thing that I thought was strange...I thought W123's were supposed to have TWO horns behind the front bumper, a High and a Low. My car only has ONE. It is on the driver's side. There is no indication that my car even came with another horn on the passenger side, but that doesn't mean it didn't. Anyone have some knowledge on the subject? Thanks!

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

have you tried talking louder to it, as things get older they loose their hearing....
but in all fun... Check the Fuses, a lot of things diddnt work on my car including the horn until I replaced them all... also if you got a volt meter check along it's path to make sure you have power all the way to the horn

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

Have you tried testing the horn by jumpering 12V to it? They do go bad sometimes.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

Fixed the horn. It turned out to be the fuse. :O It looked fine, but when I took it out it fell apart. Jeez. Thanks guys.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles