1993 Buick Lesabre.
Dear JK: My horn sometimes works & than not at all. .What can I look for?

If when the horn does work, it sounds funny, not like it use to, then that indicates bad  horn(s). If it seems to not work when the steering wheel is tilted up or down, or when  turning the wheel, then the problem is probably in the steering column.

Either a problem  with the horn pad(air bag module if it has airbags), or with the wire on the back side of  the pad that attatches to the contact in the column. The horn pad(or air bag module) will  have to come off.

Could also be a problem with the cancel cam, also inside the column.
Have seen any of these things cause your concern.
Have 2000 Buick LeSabre 3800 engine. It will just die while in normal driving but it starts back immediately. Changed fuel pump, throttle solenoid, idle control sensor, ignition module. Nothing has helped. We even put a new gas cap on it.
Two possibilities. A faulty crankshaft position sensor. This would cause a loss of spark and injector pulse, and usually does not set any codes. It is located behind the crankshaft pulley.
Or a possible faulty ignition switch. This may explain the dash lights, since the ignition switch feeds power to many of the cars electrical systems. After a stall, the check engine light should usually come on, along with a few other lights. Try tapping on the key when engine running. This will sometimes cause a faulty ignition switch to act up.
Buick Lesabre Horns Not Working All The Time

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