dvd headphones

Ok guys, I'm new to the Chrysler forum. I just bought an 05 T&C Touring signature edition van. Has the dvd (6 disc changer) and navigation system in it. We're trying to figure out how to use the headphones, but have been unsucessful in getting them to work. The headphone symbol comes up on the radio and the power to the headphones is on... but still can't get them to work. Any ideas on how to make it all work would be greatly appreciated.