Lexus GS430 User Manual page 288

AIR CONDITIONING
"DUAL" switch—
This switch is used to set the temperatures independently for
the driver's seat and front passenger seat.
Touching the switch changes from the independent mode to
the linked mode.
D Independent mode:
independently for the driver's seat and front passenger's
seat. The indicator light will come on to show that the
independent mode has been selected.
D Linked mode: The same temperature is set for the driver's
seat and front passenger's seat. The indicator light will turn
off to show that the simultaneous temperature setting mode
has been selected.
When the temperature for the front passenger's seat is
changed in linked mode, the mode is changed automatically to
independent mode.
264
Temperatures can be set
INFORMATION
Knowledge for the two−temperature selector operation
This air conditioning system has two independent
temperature selectors: left and right (for the use of
driver and front passenger respectively).
D There are cases where the temperature of the air flow
may not accurately correlate on the driver and front
passenger side according to circumstances, even if
the left and right temperature selectors are set at the
same temperature. If this situation occurs, use the
fine tune operation to adjust the air temperature on
one side.
D There are cases where one or both of the air flow
temperatures may not accurately correlate with the
set temperature according to circumstances, when
the air flow temperature settings on the left and right
are substantially different. For example, if the left
controller is set at central or neutral temperature
while the right one is set at maximum heating or
maximum cooling, or vice versa. If this situation
occurs, use the fine tune operation to adjust the air
temperature on each side.