Automatic start of heated rear window and door mirrors can be set to be activated/deactivated when the driver gets into the vehicle.1 With automatic start activated, heating will be turned on when there is a risk of ice or condensation on the windows or mirrors. Heating is automatically switched off when the window or door mirror is sufficiently warm and the condensation or ice is gone.
Tap the temperature button in the middle at the bottom of the center display to open Climate view.
Press 
Choose a setting under Auto rear defroster to activate/deactivate automatic start of heated rear window and door mirrors.