tdowidar

I;m from Sydney Australia and I'm trying to modify the sound system to play dvd's.
I have spoken to each individual manufacturer who have built the hardware, that is
1.Pioneer- manufacture the sound system (ML only do the amplifier)
2. Fujistu-Ten manufacture the 7" monitor
3. Denso- manufacture the dvd rom system for sat nav.
All of the above have supprisingly very little idea on how to modify or add to the whole set-up
because they claim they r unaware of the technical specs of the other brand's components and only TOYOTA know how all three come 2gether and operate as 1 system.

I was under the impression all i would have 2 do is add a stand alone pioneer dvd player/tuner(p7050) to the P-bus link in the existing sound system and "tap into" the either NTSC cable link for the rear camera or the RBG link from the sat nav?
ANY INFO WOULD BE THANKFUL AND APPRECIATED!