Off the topic, but a lot of people use horns way too much. They are supposed to be emergency devices, not a way to express your displeasure at someone else's driving.
The horn buttons in the steering wheel are my Panic Buttons When I hit either of these, the electric horns and both pair of air horns are activated. I have never used this mode yet, except to test the operation. This mode is "for emerency use only". Jack