How do I connect an iPhone or USB device for playback?
Open the USB port cover and plug in the USB device or iPhone using an appropriate cable. Pioneer recommends using a USB cable sold separately rather than connecting the device directly to the unit, as a directly connected device could protrude dangerously. To automatically switch to the USB source upon connection, set [USB AUTO] to [ON] in the SYSTEM settings. (Page 10)
From the official Pioneer DEH-S7200BHS Car Receiver manual, page 10
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