From what i've noticed from my airbag-ectomy is that the horn wiring and the airbag wiring seem to be forever integrated throughout the car. Anywhere you have a likely airbag connector you have a horn connector. You can spot them a mile away they are bright orange and blue. On my 94 there is a airbag/horn connector under the hood running along side the drivers side fender. Might check this wiring to see if it's hooked up or pinched or something. Also if they had to pull either airbag for any reason they would have had do disconnect the horn as well.
Again, this is just what I noticed working on my car, I am no wiring expert. I'm sure BlackRoadster will come on here soon and offer more help than I can. IIRC he's had alot of wiring experience.