Heated Glass Element: Description and Operation

Rear Window Defrost
The dual automatic temperature control (DATC) controls the rear window defrost grid and heated mirrors (if equipped) by controlling the state of the rear window defrost relay. When the rear window defrost switch is pressed, the DATC will activate the rear window defrost relay. When the relay is active, both the rear window defrost grid and the heated exterior rear view mirror glass elements are energized.

The DATC will deactivate the rear window defrost relay when one of the following conditions is met:
- The rear window defrost switch is pressed when the feature is active.
- Ignition switch state is changed from ON to OFF/LOCK.
- The 15-minute timing function is complete.