There is a wire (pink i believe) that is labeled emergency brake. If connected to the e-brake it sends a ground when the e-brake is engaged that enables video. This is to ensure that you are not driving (are in park) while watching video. To work around this, simply take the pink wire and ground it out. You can do this by attaching it to the chasis or by splicing it in to the ground wire (I believe it was black, but double check before doing any splicing).

good luck with your player!