Lexus SC 430 2002 Manual page 176

AIR CONDITIONING
Turning off the air conditioning manually will cancel the
EXHAUST GAS AUTOMATIC mode. If you select the "AUTO"
mode during fan operating, the air conditioning turns on and
the EXHAUST GAS AUTOMATIC mode will operate.
For normal use, it is best to keep the air intake control button
set to OUTSIDE AIR mode. If recirculated air is used during
heating, the windows will fog up more easily.
To change the sensitivity of the sensor switching between
the RECIRCULATED and OUTSIDE AIR in the AUTOMATIC
mode, push the air intake control button until the "AUTO"
indicator light flashes. The display changes as illustrated
below.
The sensitivity of the sensor can be adjusted only while the
vehicle has stopped.
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Each time you push the "TEMP" button, the sensitivity changes
from "+3" down to "−3". If you do not operate any button for a
few seconds or if you push a button other than the air intake
control button and driver side temperature control button, the
previous display returns.