Scion Life Link to Compatibility of 06' Pioneer to previous 03-05 model HU's
taken from a different thread...
"BTW, the iPod is still the only MP3 player with a controller/connector like that, allowing you to operate it and power it using the HU (the 06 Scion HU will even display the song titles). If you're trying to choose which MP3 player to buy, keep that in mind. "