2013 Toyota Tundra CrewMax Owners Manual - Page 466
2013 Toyota Tundra CrewMax Manual
Page 466 highlights
3 -8 . Ot he r int e rior fe a t ure s Se at he at e rs a nd ve nt ilat ors ∗ Blows air from the seats The indicator comes on. The higher the number, the stronger the airflow becomes. Heats the seats The indicator comes on. The higher the number, the warmer the seats become.