Never mind, I found the answer elsewhere. For anyone that does get stuck here is the solution (easy now I have done it)
Go out to the car (leave your phone in the house), turn on the appradio. If the radio is
playing swipe right and turn it off then press home. Swipe right and press settings. The very top setting is the
connection type. Press this and press where it says "other" and it will change to digital av. That is all you need
to do.
KC