It's possible that the switch is defective. Check the switch and go from there.
If you want to find a specialist, here's a directory link for you:
https://repairpal.com/oldsmobile-repair-in-salem-illinois
RepairPal Certified shops can diagnose and repair your 1992 Oldsmobile Achieva. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.