I have installed a Sony XAV-AX8000 in my 2010 pilot EX-L. I used the harness that Crutchfield made. I have sound from the three dash speakers and the ones in each door. I do not have any sound from the rear pillar speakers or the subwoofer. I reinstalled the factory radio while on the phone with a tech from crutchfield. When I plug in the gray connector next to the main connector,the rears and sub come on. The tech could not find any information in their documentation regarding that plug. He stated that it is not used in the install and that i should have all speakers working.