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my v2 sti had a horn issue and i believe its the same fuse as the brake lights. Check to see if they are working or not. The fuse was down in the drivers footwell on the right but i cant remember what one.
it could be a relay, my newage has a 25amp relay in the passenger side engine bay fuse box for the horn, it's the same in earlier models but how far back I'm not sure.
Trev