So I installed an aftermarket cruise control from Rostra and now my horn isn't working. Everything about the cruise control works perfectly. I also know that it isn't the paper-thin horn "ribbon circuit" (not sure exactly what it's termed) under the airbag because the horn is inoperable not only when I push on the steering wheel but also when I lock the vehicle with the remote. If the problem was with the circuit beneath the airbag I would think it would still work when remotely locking the vehicle.
I've checked the fuses that should be (according to the manual) the horn fuses and both were fine.
Any ideas?