A:Answer AMaxie,
I know the frustration you are feeling. I have several thumb drives (USB) and a Stereo System that is supposed to accept USB, Micro SD and when I tried to use them in it, it wouldn't read them as well. I found out after a lot of research the music I had on the drives had to be individual songs and not in folders and for my particular system either Mp3 or 4 format. Most of my music is in the wma (Windows Media Audio) format. I would suggest reading your vehicles user manual to see if it gives you any info on how your system read usb thumb drives. It may be that if the drive has been formated NTSF (for Windows Operating Systems) it may not be recognized. Is the drive new right ot of the package? I wish I could be of more help. I hope this helps you though.
Gary