Asus Padfone S not connect to Pioneer Avic F70DAB with Android Auto, why?

[AC Question]

Aus Padfone S not connect to Pioneer Avic F70DAB with Android Auto

Hi,

the Handy(Asus Padfone S500 with Android 5.0 and the Car Radio Pioneer F70 DAB and on both is the newset firmware)) does not connect when the usb cable is in.When the usb cable is in,only Asus Zenui starts and think there is a flash memory,but Android Auto dont start.What is the Problem?