Do we need this wire cause I just put the hdmi wire to the radio and connected it to the Apple Lightning Digital AV Adapter and I plugged the USB lightning cable from the use on the radio to the Apple Lightning Digital AV Adapter and connected the adapter to my phone and it looks like everything is running fine. can someone tell me what the purpose of the cd-ih202 is, is it just to charge the phone

Nope. You don't. You nailed it putting it together yourself. Don't worry about that cable. 

ok good lol now i put start putting everything in order and close it up cause im done, just waiting on appradio extensions