96 Black
I seem to remember issues with either the pre-94 or 94-95 horn switches. The sites custom search will help you. I tried "horn switch 1994" and:
https://www.impalassforum.com/vBull...40-1994-roadmaster-horns-come-themselves.html
96 BlackI've not heard much about the 'constant horn' problem on our tri-9 B-/D-bodies. Older GMs using the bi-metal contact plate design would do that after years of the foam separator disintegrating enough.
Horns come on by themselves (usually in the middle of the night)