See also:

Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warnings may lead to the system operating abnormally and possibly cause an accident. Have the vehicle inspected by your Lexus dealer immediately. ...

General maintenance
Listed below are the general maintenance items that should be per- formed at the intervals specified in the “Warranty and Services Guide” or “Owner’s Manual Supplement”. It is recommended ...

Adjusting sound quality and volume balance
 - Changing sound quality modes Press the “TUNE/SEL” knob. Pressing the button changes sound modes in the following order: “BAS” → “MID” → “TRE” → “FAD” & ...