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When did the power gates appear on the 3rd Gens? If it was during the run, there might or might not have the wiring there
i havent seen a 2nd gen with power liftgate...maybe the limited?
the wiring is not there on the rear harness at least on 07s and 08s I looked. it may be wired in the harness up to the rear harness. just like the power fold 3rd row seats I added to my 07. the wires were there up to the C posts but not in the rear harness and you would have to change the fuse box because that is programed in to that as well as the power 3rd row seats.