2010 Toyota Highlander Owners Manual - Page 305

3-1. Using the air conditioning system and defogger Windshield wiper de-icer∗ This feature is used to prevent ice from building up on the windshield and wiper blades. On/off Press the button to turn on the windshield wiper de-icer. The indicator light will come on. The windshield wiper de-icer will automatically turn off after approximately 15 minutes. 3