Not sure if the guy who posted the below clip is on here. If you are, THANK YOU! It was very helpful in resolving my USB port issue. It turns out that the dealer had connected the USB port cable to the Pioneer unit instead of the Harman unit. I have now reconnected it to the Harman unit, and the USB port is now working as intended
[ame="https://www.youtube.com/watch?v=A1vH6DmfhZ0"]losmt2 - 2015 FR-S factory navigation module install - YouTube[/ame]