Audio Systems: Hardwire Aux input, auxiliary input adapter, gmc sierra

Question
I'm trying to hard wire a 3.5 mm audio jack into my 2006 GMC Sierra with the Bose 6 disc changer system for an I pod. I know it can be done through the XM wires or pins in the back of the head unit. I'm just not sure which ones to tie into. Please help

Answer
that is not possible, the radio is not going to open the port if there is no xm or external cd changer all chevrolet and gmc radios are the same
this interface will let you add auxiliary audio into the factory GMC radio

http://www.oemautosound.com/pc-304-87-pie-gm12-auxv2-gm-2002-2008-auxiliary-inpu...


this interface will let you add ipod to your radio, full controls from the radio,
all the ipod text will be display on the radio screen steering controls and charge the ipod ,
you also get one more auxiliary audio input with this  

http://www.oemautosound.com/pc-512-187-pie-ipod-interface-with-auxiliary-input-x...