Lexus SC 430 2004 Manual page 186

Center vents
21st01
The center vents may be opened or closed as shown.
Side vents
21sa06
The side vents may be opened or closed as shown.
Lower vent
21sa14a
The lower vent may be opened or closed as shown.
For removing frost or fog, it is recommended that you close the
lower vent when you push the "FRONT WINDSHIELD" button,
or use the "Floor" or the "Floor/Windshield" mode.
AIR CONDITIONING
167