You said the horn 10 Amp fuse is okay and the horn is okay. Try checking the Horn Relay. On the fuse/relay box beside the left fender, The horn relay is the black rectangle relay (beside the green square relay). It should show "HORN" at the back of the fuse/relay cover.
(Sorry, I do not know how to remove the steering wheel.)
Tuesday, July 2nd, 2019 AT 6:15 PM