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