The vehicle may have outside heated mirrors which helps clear them of condensation, snow, and ice.

When the rear window defogger button is pressed, the heated mirrors are also turned on. . See "Rear Window Defogger" under Dual Automatic Climate Control System for further information.

The vehicle may have this feature.

When this button is pressed, a defogger warms the driver's and passenger's outside rearview mirrors to help clear them of ice, snow, and condensation.

If the vehicle has a rear window defogger, the heated mrrors also come on when this button is pressed. See "Rear Window Defogger" under Dual Automatic Climate Control System for more information.