2009 Toyota Camry Owners Manual - Page 173

3-1. Using the air conditioning system and defogger Rear window and outside rear view mirror defoggers Clear the rear window using the defogger. Vehicles with automatic air conditioning system On/off The defoggers will automatically turn off the operation time. The operation time is between 15 minutes and 1 hour depending on the ambient temperature and vehicle speed. Vehicles with manual air conditioning system On/off 3 Interior features The defoggers will automatically turn off the operation time. The operation time is between 15 minutes and 1 hour depending on the ambient temperature and vehicle speed.