Horn stuck

The horn is stuck on? Sounds like you may have shorted the circuit to ground. Good thing you didn't set the airbag off. You may not want to attempt this repair yourself, as you may set the airbag off doing it.

Actually, you have to work pretty hard to ignite an air bag. In this case the horn switch is built into the air bag's cover, and the only way to get that is to buy the entire air bag. You should be able to find one at any salvage yard at a reasonable cost. Leave the ignition switch off anytime the air bag assembly is unplugged to avoid setting a false diagnostic fault code.

Any time you unplug something in that circuit, it will have bright yellow connectors and those will have shorting bars on the air bag side of the connector. That renders the wires immune to static electricity which could fire the air bag. As long as you don't take the connectors apart and handle everything carefully, you don't have to worry about setting the air bag off.

The earliest air bags were held to the steering wheel with four recessed 10 mm nuts on the back of the wheel. Later versions used two 10 mm nuts, then they went to spring clips that had to be released. You'll see which style you have when you look at the replacement.