Last night (midnight) the horn went off on its own (1991 (Integra GS163K)

We were up, barely. Steady blare. I went outside and disconnected the
battery after fumbling for the right rachet bit in the dark and cold.
I think I've lost the rest of whats' left of my hearing. After
listening to the 'Car Guys' (NPR, USA) for 75 yrs., the term horn
relay sticks in my brain. This happens alot with car stuff. The car
wouldn't start while the horn was a'blaring. Haven't tried it yet
today. Easy fix? Cheers and HNY!!

 

i believe that vintage of honda has a fuse for Horn On and a fuse for Horn
Off.

Check the fuse panel.

 

This morn the car started and the horn stayed off. I checked the fuse
panel before reading this. Couldn't find one that said horn. I checked
it twice. I still could've missed it.

 

This particular vehicle has no horn relay (no kidding).

The horns in the 2nd gen Integra are always hot, with ground being normally
supplied by closing the horn switch in the steering wheel hub.

The horns are located behind the outside ends of the front bumper, meaning
they can get good and wet and salty, especially if the splash shields are
torn or missing.

If your horns are going off by themselves, chances are pretty good the
electrical connector at one of the horns is shorting out due to corrosion.