oh, life has gotten in the way - i did not dig any deeper into this issue... but it is still on my to do list...
along with rewiring the right headrest entertianment power to the left seat, wiring the AV and TV buttons to the back console, installing the rear camera, getting the carPC operationa, installing several cameras, one for the front, couple for the sides, one for the inside, maybe installing inside looking camera for something like skypel and getting DVR for those cameras...
Many plans... little time...