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I have a brand new (2014) IS350C and trying to understand the audio system.
[1] I burned a DVD with all the music I like, in mp3 format, arranged in various folders. When I insert the DVD in my computer it is recognized as a music disk and I am able to play. But, when I insert the DVD in the DVD player in the car the system says there are no music files. The DVD tab is dimmed.
[2] I hooked up my Samsung GS3 phone to the USB port under the arm rest. The phone says it is ready to be a music device. The car audio system does nothing. The USB tab is dimmed.