I DIDNT know about if they made a rear seat control interface...what i
DO know is they integrate the factory steering wheel controls w/ ANY
in-dash aftermarket system.
quite honestly i left the rest up to you to look up since i didnt, myself,
know if they did anything for the rear control integration (i have since
found there is an offering)
i DONT competely know how the rear seat controls work... (although i have
a better understanding of it now)...keep reading info follows...
im not sure if exactly what youre trying to achieve...do you want to
keep the rear system and replace the front ? or do you want to replace
the front and have multi control points and 'ZONED' audio/video ?
Pioneer just announced a NEW in dash (double din) "head unit" that
allows you to have TWO disc's in the system @ the same time (one for
nav, one for audio...and possibly dvd/video...but again i dont know
ALL the details).
Pioneer AVIC-Z2
Pioneers In-Dash Nav/DVD/Audio -->
Pioneer USA - Navigation
all that said, while writing this, I have learned that PAC Audio does
integration modules w/ the rear controls...but since im not COMPLETELY
sure what youre desiring i cant offer much more at the moment -->
Excursion - rear controls information
look over some of those links and continue to reply so we can help
figure out what exactly you want to do...