yeah my Pioneer kit did come with a square plug and it's plugged into the back of my AVIC. That is the plug that I am using when I try to hook up my IPhone or Iphone 5s. It recognizes the device, acts like it's playing the music but no sound. I have not tried the HDMI yet because I don't have the Apple adaptors that it says that I need. Not too concerned about hooking my Iphone5 up the AVIC on a normal basis, but I want my IPOD hooked up all the time and would like the plugs to be interchangable between the two devices.
I was looking at the CD-iU201N plug. It looks similiar to the plug that c