Toyota Lexusc Owner's Handbook Manual page 318

Push the "AM", "FM", "TAPE" or "DISC" button to turn on
that mode. The selected mode turns on directly.
Push these buttons if you want to switch from one mode to
another.
If the tape or disc is not set, the cassette player or compact disc
player does not turn on.
You can turn off each player by ejecting the cassette tape or
compact disc. If the audio system was previously off, then the
entire audio system will be turned off when you eject the
cassette tape or compact disc. If the another function was
previously playing, it will come on again.
With rear seat entertainment system —
You can play a DVD or CD by pushing the "DISC" button when
a disc is loaded in the DVD player. Each time you push the
"DISC" button, you change between "CD" mode on the front
audio system and the DVD player. When you play the DVD
player, "AUX" appears on the display.
AUDIO
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