XO1915BT In Dash Mobile System

Question

I just installed this into my 2004 Buick Rendezvous.I know its hooked up correctly because i can listen to the radio and the bluetooth is working fine.Whenever I insert a DVD it plays for about 2 seconds and then the screen turns blue and says "caution: do not watch screen while driving" With the type of vehicle i have, there is no break detection wire that I can ground to bypass this.Any help on how to get the DVD's to play?