I have a 2016 ST (US version) and the horn is not working. There's no fuse listed in the manual and all the other online sources regarding fuses have not worked either. When I push on the horn all I hear is a clicking noise on the passenger side down in the area of the interior fuse box. There's no relay like there is on the Focus so I'm guessing my next step it to clean the contacts in the horn itself which is a common problem from what I've read.