Weird tech question
 

So I'm pretty good with electronics. The dealership is not.

http://www.the370z.com/audio-video/5...l-bonanza.html

Next step will be to just bite the bullet and go to a specialist who will pat me on the head and tell me what I did wrong but any input/anecdotal experience you guys might have would be appreciated.

Just for reference, I installed a very similar setup in my '09 and had no issues.