Lexus RX400h2006 Owner's Manual page 381

AUDIO
The "DISC" indicator light turns on while the disc is loaded.
The player will play the track or chapter, and it will play from the
beginning of the track or chapter again after it reaches the end.
NOTICE
Never try to disassemble or oil any part of the DVD
player. Do not insert anything other than a disc into the
slot.
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8 cm (3 in.) CD singles
Your player does not need an adaptor to play CD singles. CD
singles are about 8 cm (3 in.) in diameter−smaller than
standard discs.
NOTICE
Do not use an adaptor for CD singles — it could cause
tracking errors or interfere with the ejection of CDs.