Hi Webby,
I've seen these diagrams on that thread, too. The problem is: on the same headunit I've (the same Marcel have sent the picture) there're some differences:
1 - In my unit, doesn't exists the GA_Bus pins (Audio Unit Connector C (12P).
2 - In my unit, the Audio Unit Connector B (20P) does have more pins: from a junk yard's HeadUnit harness i've seen, there're extra wiring going on pins B4, B5, B14 and B15.
I'm searching for these diagrams, because after changing the stock HeadUnit NAV from my car (the same older 2012 model) to this newer a Honda Connect HeadUnit with Android, I got everyhing working after adapting all the harness BUT i've lost the iMID display of songs info. As the iMID on the Civic EXR 2014 does use GA_BUS for comunication between the iMID and the NAV (i've tested it), I bet that these extra B connector signals from the new headunit are used for comunication between the NAV and the iMID (Maybe the DUET serial signals ??) ... I really don't have any idea...