2011 Toyota Camry Owners Manual - Page 236

3-1. Using the air conditioning system and defogger Vehicles without smart key system In order to prevent the windows from fogging up, recirculated air mode may automatically switch to outside air mode if the ambient temperature drops. This feature can be cancelled by pushing and holding the air intake mode switch for longer than 2 seconds. The feature will be reactivated when the engine switch is turned to the "ACC" or "LOCK" position.