Media Hub
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
The media hub contains two illuminated USB ports, and is powered by the APIM. The media hub has an internal 5 volt power source for the USB ports. Each port consists of two circuit connections for the 5 volt power, plus two more circuits for digital serial data.
Data is sent from the two media hub USB ports to the APIM through a single USB cable. A media hub switch manages the data from the 2 sources, sending data on the single link to the APIM.