I'm trying to piece things together myself. For the past year Ive been trying to source the 17 HDMI input parts and find out if its possible to retrofit. But no one seems to know.
Indiwork makes a plug n play HDMI input kit and also an android box that plugs into it. I'm trying to figure out if its possible to route the video from it to the RSE. That way I can use the hotspot and my DirecTV app on the rear screen for my son to watch. Proformance Diesel has a preorder for an android setup for the mylink but I'm not sure how it's setup.
http://indiwork.co.kr/shop/hd-link/hd-link-iw03c-sb-for-chevrolet/ HDMI Input
http://indiwork.co.kr/shop/device/a-link-android-settop-box/ Android Box
BlkSS, do you have any pictures of the wiring going to the RSE? I have a 16 with Factory RSE and I'm considering adding HDMI input, but I'm wondering how the screen is wired to the factory unit.
I'm looking into this option. I went to the local GMC dealer today and they tried to look up the part number for me. It's still listed as the older composite in their system so no luck. I also pulled up the GM upfitter website to check and see if the wiring was the same and it also was not listed as HDMI.
It looks like its the exact same size as the current inputs. Hopefully it's the same wiring. Also it looks like its the same one used in the Cadillac CT6 for the rear entertainment package.