Thought I would post my findings on my Edge. I had a PAC line converter going to my stock head unit with the remote turn on built into the PAC unit. I was getting popping noises from my sub when the amp would turn off. It was very frustrating and searched for days for a ACC or power antenna wire. Anyways, in the 2011 it is pin # 2(see attached). I am guessing the 2012 are the same, although you should test the wire before you do anything. Hopefully this helps some of you.
Edge ACM.pdf