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Hi, my name is***** is the year and model of your Mercedes?
Ok, you will need to check fuse 15 in the fuse box under the hood on the driver's side. If the fuse is good you may have a bad horn relay or bad horns.
I'm sorry I meant to type fuse 5 not fuse 15.
Fuse 5 is located in the back part of the fuse box. I've attached a picture below.