Not sure what you are asking?
The radio (DVD-AM-FM-CD) should play through the rear speakers automatically.
If you mean playing "over the air" channels through surround. You can search for that.
Playing "Over the Air" TV audio through surround sound
This is a post I made a while back.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).