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Ok so basically there were some pin changes in the connections between the years of each car. The JB4 unit itself is the same but the harnesses are not interchangeable or "moddable" to fit a different year. You need to get the correct harness that matches your TMAP for everything to fit properly.
Funny enough, I have an A harness JB4 (used to have a 2011 135i, now have a 2013) and need to trade for a B, so if you find a good deal on a JB4 feel free to PM me for a swap haha
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