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it is inside the steering column you need to remove the steering wheel (need steering wheel puller. remove lock plate (need lock plate removal tool) under the lock plate is the switch it kind of looks like a horse shoe with many wires going to it.
horn button and cruise control have button contacts on a circular ring surroundingthe steering shaft, that ring may not be fully square to wheel, or the contact buttons are worn, or the dividiing plastic strips are damaged- with the smoke being the moemntary shorted condition heating everything up..
My 1999 Buick Regal GS was doing the exact same thing. Replaced the ignition switch on the steering column and everything worked fine. You can buy one online for around $85. Installation took me a couple of hours.
You would have to replace the multifunction switch on the driver side of the steering column. It is not real expensive and if you are handy it is not a real hard job. The multifunction switch does all the directional wiper and headlight controls. The cruise is wired into the handle, but goes down the column. That handle jsut pulls straight out of the multifunction switch.