I did this mod last summer and have all working. I used the USB connection that was inside the center compartment and used that for the front USBs. Straight plug and play. For the center compartment USBs I took the center dash apart and connected the GM USB cable to the one free USB I saw and connected it to the brown USB connector on the console wiring. I spliced both the existing console wiring from the jump seat and the new wiring from the console together. I have everything working just fine. All
the USB ports. Charge and send data to the HU, both power ports work and the 110v port works.
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