To be sure, you should:
* Consult your owner's manual: This is the best source of information for your specific vehicle.
* Look for a small, usually square, black box: It often has a red button on it.
* Check near the fuse box: This is a common location for many vehicles.
* Search online forums: Searching for "1992 Chevrolet Lumina inertia switch location" on automotive forums might yield pictures from other owners who've located theirs.
If you can't find it after searching these areas, it might be helpful to have a mechanic locate it for you.