My horn doesn't work

The clicking behind the glove compartment area you are hearing would be that of the horn relay. Relays click when they open and close, if it's clicking when you are not wanting it to (when you're engaging horn button) then it means the relay is bad and needs replaced.

First thing to check is the relay and see if its clicking when horn button is pushed. if not check the horn button and the relay. if its clicking and no horn response check the wiring and the horn.

Heres a guide on testing wiring

https://www.2carpros.com/articles/how-to-check-wiring

Attached below is the wiring diagram for your horn