2006 Trailblazer Aux input?

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Senior Member
I am trying to figure out how to add an Aux cable to my 2006 Trailblazer so that I can plug in my phone/Ipod. There is a setting for it when you cycle through the "Band" button but there is no input on the front of the radio itself. It has the Bose 6 disc changer factory installed in the deck. From what I have seen some people say I need to get a harness adapter and some say there is an input on the back of the deck. Can anyone tell me exactly what I need before I tear into the dash?