Location of radio amplifier?

I have a 2005 Chevy Silverado 1500 LS Z71. I installed this unit ( http://www.ebay.com/itm/Car-DVD-CD-Playe...) and everything works except the radio looks just like the screen shown in the video, but no sound and it will not allow me to change the stations... I get sound from the DVD, NAV, BT, but the radio goes blank, no sound and stations will not change using the touch screen nor does it work using the tuner knob.

the amp turn on wire in a 2001 Yukon xl without Bose and WITH a factory subwoofer is located in the 9 pin connecter from the back of the radio and the color is pink. you need to run the remote wire from the aftermarket deck to the pink wire.