2013 Toyota Tundra Regular Cab Owners Manual - Page 270

3-1. Using the air conditioning system and defogger Front passenger's side temperature control dial Turn the temperature control dial clockwise (warm) or counterclockwise (cool). ● Individual mode When the front passenger's side temperature control dial in a position other than the SYNC position, the temperature for the driver and front passenger seats can be adjusted separately. ● Simultaneous mode When the front passenger's side temperature control dial in SYNC position, turn the driver's side temperature control dial can be used to adjust the temperature for driver and front passenger seats.