Horn comes on by its self
Sadly, the horn relay is built into the Smart Junction Block (passenger fuse box)
see diagram.
I think you may have a bad/sticking horn switch, which is part of the drivers airbag module. if there are no concerns with the speed control or airbag lamp on, the clock spring in the column is ok.
all the switch does is complete a ground circuit to the relay. you may have a wire pinched under the airbag in the wheel.
since an airbag is involved, I would recommend a dealer check this part. Airbags are dangerous.
Rick
SOURCE: where is located the ford f-150 horn
If you slide under the front bumper, in front of the passenger side front wheel, and look up, the high and low note horns should be on a bracket right there.
SOURCE: where is the horn located on a 1998 ford explorer
The horn is usually between the radiator and grill Assembly. The fuse is in fuse panel under the dash on the drivers side. Look at the lid and it shows the fuse placement and there use.
SOURCE: Location of the Horn Relay on a 2005 Ford Taurus
In the checkthe Cavity 38, Fuse 15A for Horn, Diagnostic Connector (ODB II).
Also can review the 2005 Ford Taurus - Owners Manual (page 178, Fuse Description).
Hope helps with this (reemmber rated this help). Good luck.
SOURCE: HORN RELAY ON MY 1999 F150 LOCATION
Engine Compartment Fuse panel, Relay 205
If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
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SOURCE: 1988 Ford Crown Vic Horn Relay Location
The horn relay IS NOT located in a box toward the front of the engine. It is located just behind the radiator overflow reservoir and attached to the inner fender next to two other relays. It is the only one without a plastic cover over the top of it. FYI, our Crown Vic horn didn't blow, and the cruise didn't work. I changed the relay and still no horn. I decided to check the horns themselves. Found wires disconnected from terminals. Touched wire to horn terminal and horn blew incessantly. (previous owner had disconnected horn rather than diagnose why) Pulled the horn "button" from steering wheel and disconnected the wire leads and horn quit. Disassembled the "button" assembly. Foam had degraded over time between the contacts. (Ford has discontinued this part). Cleaned and replaced foam with Scotch foam mounting squares with holes punched out over contacts (2 layers thick). Re-assembled and viola! Horn and cruise control both work! Relay was bad as was horn button.
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