Lexus 2003 LS Owner's Manual page 212

AIR CONDITIONING
Side vents
21L065
The side vents may be opened or closed as shown.
Lower vent
21L063
The lower vent may be opened or closed as shown.
198
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.
Rear vents
21L015a
The rear vents may be opened or closed as shown.