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OK, I've been racking my brain trying to think of how that could be the case since auto-dimming and (if applicable) compass/temp displays run off the same positive wire on all Gentex mirrors (see the wiring diagram I posted a few replies ago). But I just remembered something I keep forgetting about these mirrors until I bench test them. Yes, it follows the same wiring pinouts as all other 7-pin mirrors, BUT...unlike any other mirror, when I connect pin 1 (power to auto dimming, and if applicable, compass/mirror display), and pin 2 (ground), the mirror won't power on at all. Neither the auto-dimming NOR the display will work until I connect the map lights constant power wire to power, so there's definitely something different about the internal circuitry of these particular mirrors, and that applies to both with and without compass (just tested the without compass mirror like the one pwmin just got, and it does the same thing; auto-dimming doesn't work until the map lights constant power wire is powered). So this doesn't only impact the VFD, as the wire that powers on the VFD and the auto-dimming are the same. This just led me to test the "fully loaded" mirror above, which also has LED map lights, because I couldn't remember off the top of my head if it did the same thing. It did. Connecting power to the auto-dimming/display wire and ground (the equivalent to just pins 1 and 2 in the 7 pin mirrors) didn't do anything. I had to connect the constant power wire for the map lights in order for them to kick on. Connecting the HomeLink power and ground allowed the HomeLink to work, though. I'm guessing this holds true for any other map lights auto-dimming mirror, which is really a shame. These could be useful in a LOT of cars, but the need for a BCM with battery rundown protection feature eliminates them as an option for many older cars, especially if they're not a daily driver. Sucks.