Lexus 2003 LS Owner's Manual page 211

Center vents
21L064a
The center vents may be opened or closed as shown.
21L057b
Push the swing button to swing the vanes.
The vanes directly aimed at the driver and front passenger will
swing wider as the room temperature nears the desired
temperature. The swinging angle will also change from narrow
to wide depending on the room temperature.
21L058a
When you push the swing button with no passenger in the
front seat and the "DUAL" button ON (with the indicator
on):
The vanes directly aimed at the driver and rear passenger will
swing wider as the room temperature nears the desired
temperature. The swinging angle will also change from narrow
to wide depending on the room temperature.
When you push the swing button with no passenger on
the front seat and "DUAL" button OFF (with the indicator
off):
The vanes directly aimed at the driver will swing wider as the
room temperature nears the desired temperature. The
swinging angle will also change from narrow to wide
depending on the room temperature.
AIR CONDITIONING
197