If your digital music files are encoded in a format that your car stereo doesn’t recognize, then it won’t play them. So if you plug a USB flash drive into your head unit and nothing happens, that’s the first thing to check. The easiest solution is to find the owner’s manual for the head unit to see what types of files it can play, and then compare that list to the actual file types on the USB drive. If a manual isn’t easily available, the same information should be available via the manufacturer’s website. With an or a head unit that includes a built-in auxiliary port, the missing piece of the puzzle is hardware or software that is capable of decoding the digital music files and playing them back. This can come in the form of a dedicated MP3 player or a phone, but there are also inexpensive solutions out there that are essentially just an MP3 decoder on a board with a USB connection, aux output, and power leads, that provide something of a do it yourself alternative to actually replacing your head unit.
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Connect a USB flash drive or other audio device, such as an iPod or iPhone®. Install the flash drive or cable connector to the USB port. Searching for Music.