2010 Toyota Highlander Owners Manual - Page 286
2010 Toyota Highlander Manual
Page 286 highlights
3-1. Using the air conditioning system and defogger Front side outlets Direct air flow to the left or right, up or down. Turn the knob to open or close the vent. Rear center outlets (vehicles without rear air conditioning system) Direct air flow to the left or right, up or down. Turn the knob to open or close the vent.