Hey guys, about to try this build myself in Australia and have been reading through all the threads to make sure I'm prepared. Not sure what models you all have, but I have a 2013 coupe with the correct service manual. The defogger wiring diagram is slightly different, could be something that will fix your problem/something Nissan indirectly addressed over the years. Looks like the mirror defoggers have been added. Particularly 9C is shown as being connected to the passenger defogger and ground as well as the A/C amp in parallel.