My horn stopped working on my '99 Buick regal.I went to check the fuse but it's not on the fuse diagram.Which fuse is it?

Dont have the specs for your vehicle horn should have a re-lay also there is more then one location for fuses under hood left foot kick box under dash in lines vehicles have fuses, re-lays and circuit breakers (they are supposed to self reset) you can also try the owners manuel it should also have a diagram of fuses

If the fuse is not in the under hood fuse block look on the passengers side instrument panel.You should see at the end of the i.p. when you open the passengers side front door.Hope this helps.Good luck.