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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53937
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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Ml350: My horn is not working

Customer Question

My horn is not working
Submitted: 2 years ago.
Category: Mercedes
Expert:  Marty replied 2 years ago.
Hi, welcome to Just Answer. My name is***** 113 in the fuse box under the hood on the passenger side powers the horn relay. If the fuse has 12 volts and the horn isn't working you may have a bad horn relay or you could have two bad horns. Another possibility is that there is no signal going to the horn relay from the horn button. To diagnose the problem the signal to the horn relay should be checked or you can try replacing the horn relay and see if it solves the problem. The horn relay is also located in the passenger side fuse box. The relay is at position F in the box.
Let me know if you have any questions.