Lexus ES-300 2001 Manual page 234

AUTOMATIC AIR CONDITIONING CONTROLS
"The automatic air conditioning automatically
maintains the set temperature.
In the automatic operation mode, the air conditioning
selects the most suitable fan speed, air flow, air intake
and on–off the air conditioning according to the
temperature.
The ignition key must be in the "ON" position.
To prevent the battery from being discharged, do
not leave the air conditioning on longer than
necessary when the engine is not running.
20E093
AIR CONDITIONING
NOTICE
217