I have a 8200 NEX. I am trying to make carplay work.  I have plugged into the USB1 cable to my iPhone and changed settings. It now sees an iPod and plays the musis ok but there is nothing that looks like carplay.  

What is the trick to making this work?

i think you need IOS9+ for carplay to work, it should be in the Settings of your phone, built into the OS

plus has to be iphone 5 and up

I had the cable in USB 2 instead of 1

All works now

why did you say "I have plugged into the USB1 cable to my iPhone"