no horn after removing viber system

I’m hoping someone can help me out here been stuck on this all day. Removed a viper alarm system from my wife’s suburban, all works but horn, put all wiring back the way it was (color to color) horn does work when wire is grounded, fuse is good, tried to find the horn wire by checking wires from column for a solid ground when button depressed… no good so far??? at a loss please help before she shoots me.