Because of the variations, your best bet is to:
1. Consult your owner's manual: This is the most reliable source for the location in your specific vehicle.
2. Look carefully under the dash on the driver's side: Start by looking near the fuse box and other electrical components. Feel around for a small, square or rectangular box.
3. Search online: A search for "1994 Chrysler LeBaron inertia switch location" along with images might reveal photos from other owners showing its location.
If you can't find it, consider taking your car to a mechanic for assistance.