Rear Window Defrost

The HVAC module controls the rear window defrost relay (located in the BJB). The HVAC module activates the rear window defrost relay when the rear window defrost switch (integral to the FCIM) is pressed. If equipped, the rear window defrost can also be activated/deactivated by using a touchscreen interface or voice commands. When the rear window defrost relay is active, the rear window defrost grid is energized.