There is a part under the steering wheel on GM cars of this era. It is a round plastic part with metal conducting rail. A part on the steering wheel makes contact with the round part. When they touch, the horn blows. Either the part broke or it slipped out of the position. Steering wheel needs to be removed to repair the problem. New part or just reinstall properly. Usually this happens when someone removes the steering wheel to repair another problem. and reinstalls the wheel incorrectly. New part available at Auto parts stores.
SOURCE: horn switch is not getting power, 1994 Buick Park Ave Ultra
Have you checked the fuses? ON a buick, under the steering column there will be a set of wires. When depressing on the horm there will be 12 volt ground to the black wire. The black wire is the wire that goes to the horn relay. If you can trace ground through the wire to the relay, then the problem could be your relay. You can also put +12 volt to the horn to be sure the horn is good. If the horn sounds when putting a +12 volts the the problem again could be the relay.
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