2013 Toyota Corolla Owners Manual - Page 202

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 Clear the rear window using the defogger. Vehicles with automatic air conditioning system On/off The defoggers will automatically turn off after approximately 15 minutes. Vehicles with manual air conditioning system On/off 3 Interior features The defoggers will automatically turn off after approximately 15 minutes.