Hi. I have a Ron Arad 2015 fiat 500 and up until a few days ago I could use the usb to attaché my iPhone XS and play Audi books and music through cR speakers now no sound at all. Us. right g the phone but no sound. Anybody know how to fix this. Local fiat dealer offer to “look at it” for £145 but can’t guarantee they can tell what’s wrong