2011 Corolla - USB Port Stopped Working

#1
The USB port was working fine to play music from an Iphone 4 or 5, then one day it just wouldn't work. Tried another working cable and 3 different phones including a blackberry, it all points to the USB port being the culprit. The Aux port works fine but I would like to use the USB port for better controls and charging. According to the manual all we need to do is plug it in and if need be press the DISC/AUX button. There have been no updates on the phone since it was working to when it stopped.
When I plug in the Blackberry, the phone does show that it is charging so the connection is good.
Occasionally the stereo display Error 4 when the Iphone5 is plugged in.
Hopefully someone can shed some light on this issue, thanks.
 
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