Heated Mirror System Operation
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The rear window defogger systems controls the operation of the driver and passenger rearview mirror heaters. When the rear window defogger switch is depressed, the REAR DEFOG relay is activated, sending B+ to the driver and passenger rearview mirror heaters. Each heater also receives an individual ground.