After using the horn during a couple of emergencies, the horn just stopped working. these were very quick hard uses, but if the fuse, relay and horn is good, any ideas would be appreciated.

 

I see you don't have any replies, so I'll see if I can get things started.

Scan for trouble code clues & post All code Numbers, as they can help focus a trouble shoot.

If no code clues, you said IF the horn fuse, power relay & horn check out ok, so did they check out ok? If so, have a look at the steering wheel horn clock spring, horn contacts & wiring.
Some initial thoughts for consideration, let us know what you find.