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I took apart the MT buttons.
Honestly, with a bit of ingenuity, I think you'd be able to get them to work as is.
Mechanically speaking, the MT buttons are pretty much the same as the AT. The center blank is still a button, and it's still hinged in the middle, but it's got a wide flange around it that keeps it from moving. If you trimmed the flange, you could get it to move. The PCB is the same but the two rubber membranes that short out the AT buttons are gone. If you could find the right part, they could be added back in. There's no control logic on the button PCB either. There is one common pin and then each button shorts its own pin to the common pin. So there's three pins on the MT (TCS, VSC, common) and five on the AT (TCS, VSC, Snow, Sport, common) plus I think two pins that are just for lighting. I am not sure if the common pin is vehicle ground or what, I haven't measured. But the traces are all there, there may even be the additional pins in the connector (I don't remember, it's been months since I took them apart), You'd still need to find a way to connect into the HU. I wouldn't feel comfortable connecting the SWC common pin on the HU to the common pin on the buttons, I don't know if they'd play nice.
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