Any way to get DVD audio through the Aquos LCD in my 2005 Safari???

[MG911]

Hello all...I have an '05 Safari with A/V upgrade (JVC DVD/CD & Sony Aquos LCD..subwoofer, etc.) and I'm having a heck of a time trying to figure something out.

Is there anyway to turn off the main interior speakers and just be able to listen to a movie through the TV?? There are 2 sets of red/white RCA cables connected to the rear of the TV inputs so there has GOT to be a way to do this. I e-mailed AS about this and Tim said, "no, the head unit supplies audio through the interior speakers only". I'm baffled then as to why there are 2 sets of audio cables connected into the TV?!

I spoke with another AS owner today who has the Sony head unit and he said he IS able to switch DVD audio between his TV and the interior speakers. When the children are sleeping at night, it would be nice to watch a movie without it being so loud (even when I fade from rear speakers to front speakers only). Conversely, it would be nice not to hear Cinderella in surround sound all the time!

Any help would be much appreciated!
Mike