check fuse firstif its not that then check the wiring out of the horn connector... ie: loose connector or bad wire, or the contacts on the horn button themself corroded?i agree i dont think its the horns themselves because both stopped working same time. you can test by putting 12v to them.
There is a relay.How do you know both stopped working at the same time? You might have only had 1 working and jsut assumed both were.
On my Rabbit GTI, the horn doesn't work,... but I can hear the relay click. Doesn't let the jerk cutting my off know I'm there,... but checking the relay is about that easy.
It's easy to tell when one vs two are working. Completely different sound.