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I have thought about doing the same thing, and have looked up what it would cost to buy a spare set of M Sport buttons to cut up and rewire. I'm pretty sure at this point that cutting and rewiring won't be necessary. From the look of the pinouts it should be as simple as popping off the blanks, put in the M buttons, then attempt to tap the LIN port off the steering wheel controller or just tap the CAN BUS of the steering controller. CAN bus would give you more info, but LIN bus guarantees you that the signal absolutely coming from the steering wheel buttons.
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