Behind the plastic shroud under the front bumper, passenger side.
Easiest way to get to it is to take out the passenger side headlamp and look down, there will be a small flap of rubbery plastic. CAREFULLY pull out the clips and pull that out of the way, its right behind that.
The horn on a 2005 Pontiac Sunfire, the actual horn is located behind the front bumper. To make the horn sound, you press on the center of the steering wheel.
The horn is located behind the front bumper fascia
The horn is located under the passenger side headlamp assembly.
how to check fuse for horn in a 1998 Pontiac sunfire
1996 Pontiac sunfire horn fuseIt would be named cig and will be the color blue on the fuse box.
See stvndberryhill's answer under 1998 Pontiac Sunfire horn relays. This answer applies to all year models of Pontiac Sunfires.
where is the starter located on 2005 pontiac sunfire
where is the fuel filter located on a 2003 Pontiac sunfire
The horn fuse works through the cigeret lighter fuse
See stvndberryhill's answer under 1998 Sunfire horn relays. It is explained in great detail. The guy knows what he's talking about.
2003 sunfire
There isn't a fuse for the horn. The horn instead uses a relay to function. The GM Parts Department specifies it is located underneath the driver's side panel where the accelleration and brake pedals are.