Ok, I finally got my buttons from AliExpress... Cheap, good paint, slightly tight fit, but real slow (I ordered them roughly a month ago).
The short answer is that they don't do anything, even with the steering wheel set to the M_Drive setting.
I need to test that the buttons actually complete a circuit, though the original post seems to confirm it, and I doubt the LEDs would do anything in that regard. I still feel like I'm missing something that ties all of this together though (the ability for the HU to actually set M1 and M2 settings).
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