I have a 86 Astro and the horn decided to go full blast constantly (had to pull the battery) No alarm system, no air bag
this morning As I start to back up it started, hitting the horn button and wiggling the steering wheel didn't help.

I realize it likely is the horn switch or the wire in the column causing the problem. I will address this later, but for now the best option will be to pull the relay, but I don't know where it is hiding

I could pull the fuse if necessary, but I think it affects other features.

I could disconnect the horns, but the relay will be active and slowly drain my battery.

Any help will be appreciated.
Dan

 

after pulling the fuse and living with having to reprogram the radio every time I turned it on, I had a chance to put a meter to the circuit. I discovered the horn button switch had failed. Now a trip to the local P/P is all I need.
at least the radio works now, soon the horn will again