Horn not working

[mkbruin]

When I press the horn I hear a clicking from the area of the fuse box in the passenger footwell, but the horn doesn’t work. Any idea?

 

[Trainmaster]

Find which relay is clicking in the fuse box and swap it with a different one from the fuse box. If that doesn't work, check the voltage at the horn with a test light. If it's getting voltage, change the horn.