I have the avic-x920bt and I am trying to figure out if it is possible to split the usb cable from the back of the unit. I have the iphone cable plugged in currently and it is all tucked away behind the dash. This makes it difficult to unplug the iphone cable and plug in other usb devices. I would like to find a way to split the usb cable so I can plug the iphone cable in, but also have another usb input easily accessible to plug in thumb drives etc. I tried a usb y cable (1 male to 2 female) and it charges on both, but will no longer recognize the iphone or any usb device. When I plug in the iphone and a usb device at once I get an usb error. I don't need both pluged in at the same time, but I would like to have the extra usb plug available without haveing to unplug the iphone cable. If anyone can give me some advice I would appreciate it!