2011 Lexus IS 350 User Guide - Page 236

3-1. Using the air conditioning system and defogger Rear window 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. With navigation system Owners of models equipped with a navigation system should refer to the "Navigation System Owner's Manual". Without navigation system On/off The defoggers will automatically turn off after 15 to 60 minutes. The operation time changes according to the ambient temperature and vehicle speed. 3 Interior features n The defogger can be operated when The "ENGINE START STOP" switch is in IGNITION ON mode. n When the retractable hardtop is open The rear window defogger is not operable. The indicator will come on if the outside rear view mirror defoggers are used. CAUTION n When the outside rear view mirror defoggers are on Do not touch the outside surface of the rear view mirror, as it can become very hot and burn you. 245