To be certain, you should:
* Consult your owner's manual: This is the best source of information for your specific vehicle.
* Search online for "2005 Chevy Malibu Classic inertia switch location": Images from other owners might show the precise location.
If you can't find it visually, using a flashlight and carefully feeling around in that general area might help you locate it. It's usually a small, square or rectangular box with a button.