2007 GMC Canyon Radio Wiring

I've found semi relevant wiring information (not specific to 07 GMC Canyon), but it's missing the function of the two purple wires and orange one. Appear to be power related. My manual does not show the wiring diagram. Thanks in advance. Grey is the 07 wiring, black and white are what I'm hooking it up too.

Next time Use this

Radio 12V      orange      +      radio            Radio Ground      black/white      -      radio            Radio Ignition      (Class 2 Serial Data)                      Radio Illumination      (Class 2 Serial Data)                      Left Front Speaker (+/-)      tan - gray      +,-      radio            Right Front Speaker (+/-)      lt. green - dk. green      +,-      radio            Left Rear Speaker (+/-)      brown - yellow      +,-      radio            Right Rear Speaker (+/-)      dk. blue - lt. blue      +,-      radio       You will have to find a switched power source to connect to the red wire of the radio. If the Air Conditioner control piece has a plug with larger wires than the other plug, there is a brown wire on the plug with the larger wires.