I'm interested in this, too. I really wanted the GDO but didn't want the premium package. I asked my salesman and he indicated that the auto-dimming mirror and GDO could be added, but would cost about $500. Not sure how much of that was parts vs. labor. But, maybe that suggests the necessary wiring is already there.
I didn't have them install it, but if there is a way I can install it myself at a much lower cost, I'll definitely reconsider.
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