Where is the horn on a Ford Five Hundred?

The Horn on the 500 is located behind the front grille, just to the left of the hood latch on the core support as you are facing the engine from the front of the vehicle. There are two plastic fasteners, one on each side of the plastic trim that covers this area, that can be removed. Then the grille can be pulled back a few inches to expose the horn assembly without removing the grille or anything else. Very easy access and a five minute job to replace the horns.