2012 Toyota Prius Owners Manual - Page 641

3 -1 . U sing t he a ir c ondit ioning syst e m a nd de fogge r Sola r Ve nt ilat ion Syst e m ∗ The Solar Ventilation System uses energy provided by solar panel built into the roof to operate a fan contained within the air conditioning system, allowing ventilation of the vehicle interior when the vehicle is parked in direct sunlight.