Lexus 2012 RX450h Owner's Manual page 596

3-4. Using the audio system
USB memory functions
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Depending on the USB memory that is connected to the system, the device
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itself may not be operable and certain functions may not be available. If the
device is inoperable or a function is unavailable due to a malfunction (as
opposed to a system specification), disconnecting the device and reconnecting
it once again may resolve the problem.
If the USB memory still does not begin operation after being disconnected and
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reconnected, format the memory.
Display
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P. 568
Error messages
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"ERROR": This indicates a problem in the USB memory or its connection.
"NO MUSIC": This indicates that no MP3/WMA files are included in the USB
memory.
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