Lexus RX300 Manual page 159

AIR CONDITIONING AND AUDIO
Using your audio system: some basics
This section describes some of the basic features of the Lexus audio
system. Some information may not pertain to your system.
Your audio system works when the ignition key is in the "ACC" or
"ON" position.
NOTICE
To prevent the battery from being discharged, do not leave the
car audio on longer than necessary when the engine is not
running.
(a) Turning the system on and off
20R011
Push this knob to turn the audio system on and off. Turn this
knob to adjust the volume.
The system turns on in the last mode used.
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20R043a
Push the "MUTE" button to decrease the volume momentarily.
To return to its original volume, push the same button again.
When the audio system is turned on, the mute is always off regardless
of the previous mode.