Problem solved Part 1: with the help of johnmn, we figured out that the CA connector in the OE Trailer wiring harness is just a jumper wire (verified with Ohm meter) and does not need to be used.

I re-routed the original wiring harness to the CA antenna and the PDC connector. Then I installed the new OE trailer wiring harness as per instructions ... and tied the extra CA connector securely out of the way:

Attached Images

  

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PAX5
BMW CCA #20645