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Check the connection to the horn? be sure they are properly grounded. Also the horn switch on the steering wheel may be not making a connection with the ring plate behind the steering wheel and before the column.
You have a defective clock spring ribbon rotating contact drum under the steering wheel, contact a local repair shop for more details on this part and how to replace it, since the airbag is involved in this repair it is best left to the dealer or a shop you trust.
You would have to unplug the horn to stop it from blowing or take out the fuse. The problem could be in the steering column or the switch. These are the start points to check and find the problem. Take off your pad where the switches are and unplug the wire to the switch and see if the horn still blows. If it does it the problem may be in the column or the wiring. If you are not familiar with the steering column take your car to a shop. The steering column is not something you want to mess with if you are not sure of the workings of the column.
The metal plate in reference above has small copper contacts. If they do not meet the horn will not work. We used a dremel on ALL of the contact point and it made no difference, the horn still only works about 5% of the time. After a whole lot of testing (I have the same issue with my 2000 Toyota Sienna) we found that the ground is weak, too weak for the relay most times. At this point I am going to run an alternate ground by "borrowing" the wire for the mute button for audio controls through the clock spring. The existing ground connects to the steering column. Before we discovered this I spent $285 on a new clock spring :(
start at the horn to see if it the wire is connected, then i would remove that wire and use a jumper wire from a positive(battery) to the horn itself and see if you get any sound. If the horn beeps then the horn itself is not the issue. check your horn fuse and relay. if you are getting power at the fuse and relay it is somewhere in the steering column. possible the horn pad itself or the horn cam. If you have have this in for repairs in the past dealing with the steering column it might not have been hooked back up properly. but then again how often do you use your horn it might have been not working for quite awhile. hope this helps.
There is something called a clock spring in the column that is used for the airbag, horn and cruise control buttons. This clock spring if messed with will cause a/bag light to come on and possibly cause a/bag failure if there is a collision. DON"T mess with the wiring in the column. Run new wires in to the horn or install an a/market horn.