Me and a friend are installing an after-market pioneer radio in my 2004 Grand Prix GT. I honestly don't know what I am doing but he does, but we seem to have hit a speed bump. We have connected all of the wires from the stock stero except for these 3 that were wrapped seperately, brown, green and black, all with a white stripe on them. Anyone have any idea where they are supposed to be connected? My after market stereo has power, it was able to take in a cd and eject it, but the display was not on at all and i could not get it to play any sound...