The horn relay is in the under hood fuse block. Verify power to the relay lets use this guide to test. Also I have included the fuse panel and relay location diagrams below for the car with the horn wiring diagrams so you can see how the system works.
Feel free to ask any follow up question if you still have issues.
Roy
Jul 27, 2018 at 2:53 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.