Lexus 2003 LS Owner's Manual page 481

Volume Up Switch
To raise volume level, press either function key 1 on the com-
mand module, or touch
If function key 1 is pressed and held on the command module,
or is touched and held on the console display, the level of
the volume will increase every half second until the maximum
volume is achieved.
Volume Down Switch
To lower the volume level, press function key 2 on the com-
mand module, or touch
If function key 2 is pressed and held on the command module,
or if
is touched and held on the console display, the level of vol-
ume will decrease every half second until the minimum volume
is achieved.
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Section 3
on the console display.
on the console display.