Lexus GS300 1998 Owner's Manual page 210

2. Use the "TEMP" or "PASSENGER TEMP" button to
set the desired temperature.
The "TEMP" or "PASSENGER TEMP" button is used to set
the desired temperature. The temperature will be controlled
on the driver and passenger sides simultaneously or
individually.
"TEMP" button – Changes the temperature on the driver
and passenger sides simultaneously or the driver side only.
"PASSENGER TEMP" button – Changes the temperature
on the passenger side only.
"DUAL" button – Changes the mode of the temperature
setting.
The indicator on the "DUAL" button has two modes:
D With the indicator on – For individual temperature
setting
D With the indicator off – For simultaneous temperature
setting
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