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check horn fuse or relay in fuse and relay box (under hood). The fuse you can visually check by looking for a blown metal strip in the fuse (use chart on fuse box lid for labels). relays are more difficult to explain how to test. but they are cheap. you can try buying a new horn relay and installing it. after that, if it still doesn't work there could be a probably with the switch in the steering wheel. if it is i recommend you take it to a shop to diag and fix. worst case it could be a bad horn and/or elctrical wire and connection. A local shop could fix this. But check the horn fuse and relay that more than likely what it is.
What I do to check a horn is first to run a heavy wire directly from the battery positive terminal to the horn's connector. Most often the horn gets its ground from being bolted to the car so there is but one connector. On a Benz though who knows, you may have more than one terminal and you will have to deduce which one is for the +12VDC. Benz battery may be under the rear seat or in the trunk instead of under the hood like on a real car. Anyhow if you can find the horn and the battery and the horn sounds with a direct connection then you know the problem is the switch, or horn relay, or fuse. I will bet that a Benz tech will have to pull the steering wheel off with a special tool but you could most likely get at the relay and fuse yourself. If you replace the relay and fuse and still no horn then surrender the car and all your credit cards to a dealer. Pull the fuses out one by one and hold them up to a light to see if one is blown. On a real car usually there is a map or key stamped into the cover of the fuse box telling you what fuse or relay is for which gadget.
About four things to do, first check voltage at horn with key on and button pressed. If voltage there try moving the small gap screw back and fourth a few times. If that doen't work replace horn. If no voltage check fuse and horn relay, you should be able to hear the relay click when you push the horn button, If not and fuse is ok. Switch relay out with another on on the car. If that doesn't fix it check the horn button for continuity.