Horn Problems Need HELP!!!

alright i got a temp ticket for my horn not working and i have 2 days to fix it, i checked the fuse, the horn the ground in the column and its all O.K., only thing i can think of is a relay of some sort?? if any knows where the relay is for the horn or can get a wiring diagram it would be a life saver!!!

im a lil late but just wire up a new ground and a new hot wire and have a push button for a day...