Audio Systems: aux input source 2005 silverado, chevy siverado, stock cd

Question
i would like to install a sirius recievr in my 2005 chevy siverado w stock cd player. there is no aux input socket on outside of stereo. there is a button for aux so i was wondering if there is an input source behind the dash in stereo wiring or if i need to add wiring for an auxillary input. would like to know before  i take the dash apart. Thank you in advance for your help with this.

Answer
there is a SIRIUS port behind the radio
you need to buy the sirius receiver the antenna and the GM cable

If you are trying to install a portable unit, yes there is a port for that but you need the aux interface and the cable
follow this link


http://www.oemautosound.com/pc-296-147-pie-gm12-aux-chevrolet-auxiliary-adaptor....