Pioneer AVH-5200DVD - Manual (Page 20)

! USB storage device that can be charged via
USB will be recharged when plugged in and
the ignition switch is set to ACC or ON.
However, the USB storage device that can be
charged via USB will not be recharged when
you select an SD as the source.
! Disconnect the USB portable audio player/
USB memory when you are done using it.
En
20
Section
07 Playing audio