I am doing a similar set up with my Alpine Head Unit
Like you have a have gone the 2 way switch way, centre pole to the buttons, top and bottom poles to each of the steering wheel adaptors.
It works fine, just have to make sure everything is well grounded as the buttons work on resistance to ground so if you change it too much they don't work (correct me if I'm wrong here)
Wasn't an issue with my alpine and carpc as I could just set the resistances and what they control... might be an issue with oem stereos tho...



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