2009 Lexus IS 350 Navigation Manual - Page 240

AIR CONDITIONING (b) Windshield defogging and defrosting To remove interior fog on the windshield - To remove frost or exterior fog on the windshield- 1. Push the "TEMP" (" ") button to set the "HI". 2. Push the windshield air flow button. 3. Touch fan speed control touch−screen button on the right side to obtain a maximum air flow. Push the windshield air flow button. 4. Leave "A/C" off. When the windshield air flow button is pushed while operating in automatic mode, the air conditioning is set to operate. If you push the windshield air flow button once again while in the windshield air flow mode, the mode then returns to the last mode used. CAUTION To prevent the windshield from fogging up, do not use the windshield air flow button during cooled air operation in extremely humid weather. The difference between the temperature of the outside air and that of the windshield could cause the outer surface of the windshield to fog up blocking your vision. 260