To find it, you might need to:
* Feel around: Run your hand along the floor under the passenger side dash. It's often a small, usually red, square or rectangular box.
* Look carefully: Use a flashlight to thoroughly examine the area under the dash.
* Consult your owner's manual: Your owner's manual should have a diagram showing the location of the inertia switch.
If you can't locate it after trying these steps, a Ford dealership or a qualified mechanic will be able to help you find it.