Pinpoint Test S: Loud Popping Sound When Cycling The Ignition Switch: Notes
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Refer to the appropriate SYSTEM WIRING DIAGRAMS article for schematic and connector information.