Did you check to see if the fuse isn't blown in the fuse box? Check to see if you are getting a good ground when the horn is pressed. Then check to see if the horn is even getting power. If it is then your horn is probably bad.
It's the large center button on the steering wheel with the Fiero Pegasus logo. If the horn is not working there's a problem with it. Actually the horn is located under the front bumper, I believe on the drivers side.
Where is Horn for 1997 Pontiac Transport?
where is the horn on 2001 pontiac aztec
how to check fuse for horn in a 1998 Pontiac sunfire
In the passenger cabin, under the dashboard on the passenger side.
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.
See stvndberryhill's answer under 1998 Pontiac Sunfire horn relays. This answer applies to all year models of Pontiac Sunfires.
To fix the horn on a 1988 Camaro, check the horn fuse first. Then check the horn relay, wiring, horn, and switch to find the problem.
The horn is under the left head light .
Where
The horn is located behind the front bumper fascia
The 1994 Pontiac Firebird horn relay switch can be found on the inside of the front quarter panel. The horn relay switch will be on the drivers side quarter panel.