Why is my FIAT 500 usb music not working?

The FIAT 500 USB music may not work for many reasons such as a blown fuse, short or damaged wiring, device error, or USB may not be recognized. The first thing You can do is look for fuses that are found in the interior fuse panel on the far right side under the headlight controls.. First, You can search to see if the USB is functioning on any device and can identify the device. To see if there are any loose connections or rust, You should even inspect the wiring behind the gas that is attached to the USB port. One thing to remember is the port does need to be secure or it will not allow You to switch over to the USB media source. Sometimes the port will become loose from wear and tear when plugging and unplugging the cord so double check that it is plugged in tight to avoid any issues.