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See stvndberryhill's answer under 1998 Pontiac Sunfire horn relays. This answer applies to all year models of Pontiac Sunfires.
how to check fuse for horn in a 1998 Pontiac sunfire
Horn relay Switches at steering wheel
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 relay on my '03 sunfire is under the dasboard taped to the wire bundle to the left side of the steering column.
The horn is located behind the front bumper fascia
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.
1996 Pontiac sunfire horn fuseIt would be named cig and will be the color blue on the fuse box.
The horn is located under the passenger side headlamp assembly.
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.
The horn fuse works through the cigeret lighter fuse
the horn relay for the 2002 Neon is located under the hood. It is inside of the relay box, the lid should tell you which relay is for the horn.