Before you pull the wheel (which involves removing the air bag unit) you can test the horn switch at its connector with the cable reel (newfangled horn ring). First remove the dashboard lower cover under the steering column. Remove the steering column upper and lower covers. Disconnect the dashboard wire harness connector (4 pins) from the cable reel. Check for continuity between the cable reel no.2 terminal (light green/blue stripe wire) and body ground in each horn switch position. There should be continuity when horn is pushed and no continuity when horn is released. If one or both continuity checks fail, then you'll have to remove the airbag and change out the cable reel.
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