Toyota Lexusc Owner's Handbook Manual page 301

AIR CONDITIONING
3 Floor — Air flows mainly from the floor vents and rear
vents.
4 Floor/windshield — Air flows mainly from the floor vents,
windshield vents and rear vents.
Take in the fresh air with selecting the OUTSIDE AIR
mode by the air intake control button.
282
If manual fan speed control is desired —
"
Fan speed at low Fan speed at high
1 2
The fan speed can be set to your desired speed by pushing the
appropriate side of fan speed control button. The higher the fan
speed is, the more air is delivered. Push the ">" (increase) or
"<" (decrease) side of the button to adjust the fan speed.
Pushing the "OFF" button turns off the fan.
To remove the exterior windshield frost and interior windshield
fog, use the high speed setting.