Rear Window Defrost

For MKZ, the rear window defrost switch is integral to the FCIM. For Fusion, the rear window defrost switch is integral to the HVAC module or FCIM if equipped with navigation system. When the rear window defrost switch is pressed, the HVAC module will activate the rear window defrost relay. When the rear window defrost relay is activated, the rear window defrost grid will be energized.