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.
The P0565 trouble code on a 1994 Buick LeSabre Limited indicates a problem with the cruise control system, specifically related to the cruise control switch or wiring. To repair it, first inspect the cruise control switch for any damage or malfunction. Next, check the wiring and connectors for corrosion or loose connections. If necessary, replace the switch or repair the wiring to resolve the issue. After making repairs, clear the code and test the cruise control system to ensure it functions properly.
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.
Under an air filter
There does not seem to by any way to repair the horn, the airbag has to be replaced.
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Yes, the steering columns from the 1993 and 1994 Buick Roadmaster are generally interchangeable, as both model years typically share the same platform and components. However, it's always advisable to verify specific part numbers and any potential differences in features, such as cruise control or airbag systems, to ensure compatibility. Checking with a Buick parts specialist or service manual can provide further confirmation.