Ahh! Sorry, I misread your original question.
It looks like the Rear Seat Entertainment gets its feed from the head unit via the MOST Bus and a video feed from the head-unit that contains the TV signal.
So you _could_ (it looks like) remove the head-unit but continue to enjoy the rear seat entertainment, but, there would be a huge issue - when I had my L322 with the RSE package, the only way of selecting inputs was from the main touchscreen - there was a way from the rear centre console remote, but I do not know if this would render the RSE inoperative without the head unit at least initialising the MOST communication.
I guess the easiest way of find in out is to locate the Rear Seat Entertainment Module and unplug connector C2109...
![](http://www.fullfatrr.com/gallery/albums/userpics/14808/Capture3.PNG) | Click image to enlarge | 2017 - L405 SC - WOW! just WOW!
2014 - L405 4.4
2010 - L322 3.6 - Carried me 100,581 miles then broke big-time
There are 10 types of people in this world;
Those that understand binary,
and those that don't.
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