We've had our 2013 RX350 for a couple of months and decided to try out the USB port for playing MP3 songs.
It plays songs fine, but there does not seem to be a way to select Random Playback.
Our radio does not have the row of buttons shown in the Owners Manual that has the 1 RAND button.
Is there another way to select the random feature?

 

While USB/mp3 is playing, press pad/Menu button, select Audio, select Random (bottom row), exit menu

 

Works great!
I didn't find that menu while poking around.
Thanks