I would love to get the answer to this as well. I installed the same unit and the dealer did the install. They indicated that the rear selector did not work for the units pluged into the gm24. I have not even tried. The unit works great other than that.
I will watch for answers.
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White 05 Lux, 35\'s on 18 MKW M19s, Manic guards and roof racks, Magnaflow muffler and NAV.
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