IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.
NOTE: Not all car stereo receivers have USB capabilities. To see if your car stereo has the USB function described in this solution, check the specifications or the supplied operating guide. Manuals are posted on your model support page.
This is normal since the USB device is the priority for automatic music playback. If you want to listen to a music from another device, disconnect the USB device or change the source by pressing the SOURCE button.