I have the same adapter harness that came with an emulator. Mine had jumpers inside that I had to solder to get PDC working. Some of the versions I have seen on line had jumpers you could pull off. If you cared, you could pop off the cover and see if you had any other jumpers on anything other than the first 2 from the left. 3rd and 4th are PDC enable.

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2009 35d, 2006 325i & 330i