2009 Toyota Sienna Owners Manual - Page 275

3-1. Using the air conditioning system and defogger Feet and windshield n Switching between outside air and recirculated air modes Press . 3 The mode switches between outside air mode (indicator off) and recirculated air mode (indicator on) each time is pressed. Interior features Defogging the windshield Press . The air conditioning system operates automatically. Recirculated air mode will automatically switch to outside air mode. It is not possible to return to recirculated air mode when the switch is on. 249