Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
I'd suggest checking that you're getting 12V at the horn itself
this is located under the bumper as this image shows
its not uncommon for the horn to fail with internal corrosion so they do need replacing from time to time
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning andthis is held by the site until you rate my answer at which point the cash issplit between the site and the expert. I am only paid for my work on thisquestion if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you