iphone 5 wont play music in car

Hello,

I just got my new Iphone 5 64gb unlocked , Im still using AT& T as i been for the last 6-7 years

I had an iphone 4s and im alaways used it in my car to play music ,radio apps, gps etc...

my new phone WONT play music when connected with the original usb carger (it will charge but no audio) in my car - I updated to the new 6.1.4 and i think that the issue , my wife iphone 5 WILL PLAY !!

any ideas??

alrady try restoring , playing with def phones , looking online , using def usb ....