Spiderlife

Hello everyone, thank you for reading. We recently bought a 2004 Grand Voyager and been spending the last few days getting acquainted with it We noticed it has a 3pin entry point in the back, offside rear door. The red white and yellow type usually used for media input. Heard a rumour this could be a way to put media onto the DVD screen which would be very useful! Could anyone advise whether this is actually possible? And how to go about using it? And if it isn't for media what on earth is it for hehehe. Thanks!