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Haven't looked at a Buick for a long time, but the older ones it used to be either the short cable from the cruise control to the speedometer or the control module itself. Drivers side inner fender, right on top. Don't know if they were still using the same system in 92 or not but imagine they did.
Under an air filter
First you need to troubleshoot the 1994 LeSabre cruise control. Check the fuse, the cruise switch, the linkage, to find where the problem is. Check the vacuum lines on the engine as a vacuum leak can cause the cruise to not work properly.
There does not seem to by any way to repair the horn, the airbag has to be replaced.
How to unlock a buick roadmaster
Powertrain Control Module (PCM)
why is my 1995 buick roadmaster running hot
Low freon
PCM Location where is the ecm or brain in a 95 buick roadmaster
where is horn relay on 1995 buick roadmaster
what is the gross weight of a buick roadmaster wagon
The Buick Roadmaster was not produced in 1986. They were made from 1991 to 1996.