2009 Toyota 4Runner Owners Manual - Page 357

3 -6 . Ot he r int e rior fe a t ure s Se at he at e rs (if e quippe d) On The indicator comes on. Adjusts the seat temperature. The further you turn the dial upward, the warmer the seat becomes. n The seat heaters can be used when The engine switch is in the ON position. n When not in use Turn the dial fully downward. The indicator turns off. 334