Rear Window Defrost
WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
When the rear window defrost switch is pressed and the engine is running, the HVAC will activate the rear window defrost relay located in the Battery Junction Box (BJB). When the rear window defrost relay is active, the heated backlight will be energized.