Check to see if your reverse lights are out. The horn shares a fuse with that. Probably not but worth a try.
23
P/I 2
40
P position control system, horn, headlights (low beam), back-up light
For a few bucks you could bypass the steering wheel horn and mount a horn button.
https://www.amazon.com/Wolo-HS-2-Horn-Button-Switch/dp/B001HJR9XE/ref=sr_1_1?keywords=auto+horn+button&qid=1583358159&s=automotive&sr=1-1#customerReviews