Popular repair tips from the Car Doctor
Stop the honking car
The problem is more than likely a faulty horn-relay or horn button. I have seen several cases where the cover over the airbag shrinks in cold weather and causes the horn to sound. I can't imagine the electronic complexity of a device that could trigger a horn. If the car has an alarm it is possible that the alarm is sounding due to vibrations. I have seen tractor trailers and motorcycles set off car alarms.