When iPhone 5s is connected via USB no audio is heard

Hi There -
I've seen older threads on this issue but I don't think I've really come across any solutions. My issue started yesterday; now before reading further I have to ask that you please keep in mind that I did perform the latest upgrade on my iPhone a bit earlier in the day.
When I connect my iPhone to my vehicle sync system and announce that I'd like to connect via USB, the voice recognition repeats my request and then the music on my iPhone shows to be playing on the display in my vehicle. The problem is that though the music appears to be playing and the minutes played are being displayed there is no audio coming through. When I switch to the Bluetooth Audio option all sound comes through.
Now, as a 2nd test, we connected my sons iPhone 5s via USB (he has not taken the latest update on his iPhone) and the same issue happens with his. Voice recognition changes to the USB format as requested, music appears to be playing but no audio is heard. When we change his phone to Bluetooth Audio the audio comes through nice and clear.
I'm not entirely convinced the update caused the issue so I wanted to put this out there to see if anyone has run into this and were able to actually resolve the issue.
I know the USB cable is working fine because when I do plug it into either phone the phone makes the little connection sound and pops up a brief battery percentage box. I also know the cable is working because when we announce USB as our audio of choice the system recognize USB via the iPhone.
One other thing I tried looking for was the option on the phone to switch from Docked to Synch - I know on my iPhone 4 I was able to switch back and forth through iTunes and would also have the option if I tried to watch anything via You Tube when connected to the dock; I cannot find this anywhere on the 5s when connected via USB.
Help is greatly appreciated!!!

I have had similar troubles with wifi.. some improvement removing BlackBerry desktop software & drivers & reinstalling after reboot... I used the same installer I had previously, but a fresh downloaded installer couldn't hurt...
10.3.1 SW .1779 OS .2726 WLAN .1.1 Radio .2727

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