Toyota Yaris Owner's Manual page 292

292
6-1. Using the air conditioning system and defogger

Adjusting the position, opening and closing the air outlets
Front center outlets

1
Direct air flow to the left or
right, up or down.
2
Turn the knob to open or
close the vent.
Front side outlets

Direct air flow to the left or right,
up or down.
1
Open the vent.
2
Close the vent.