Check the voltage to the horn. You will need to access the horns, disconnect the wires at the connector and have someone push and hold the horn button on. You should have battery voltage. It should be 12.3 or better volts.
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.