Dvd Player Audio Options

[wilbur1969]

Hi I have a 2005 Previa with the TNS300 stereo system and sat nav installed the original one not the bells and whistles one from the new range, I'd like to fit a rear screen with built in dvd player for the rear passenger entertainment on long journeys etc and I'm wondering if I can route the audio to the stereo and use the cars speakers for playing the sound? Does anyone know whether there is an input on the tns300 or a is there a cd changer input available that I could use? Any help would be much appreciated.