2012 Toyota Yaris Owners Manual - Page 550

3 -1 . U sing t he a ir c ondit ioning syst e m a nd de fogge r Rear w indow and outside rear view mirror defoggers ∗ These features are used to defog the rear window, and to remove raindrops, dew and frost from the outside rear view mirrors∗. On/off Press the button to turn on the rear window and outside rear view mirror defogger. The indicator light will come on. Pressing the button again also turns the defoggers off. Vehicles with timer: The defoggers will automatically turn off after approximately 15 minutes.