Problem installing OEM hitch and harness

[dglcinc]

Hi All:

I got the following OEM part numbers for my E70 vin 0E08575:

71-60-2-156-525 trailer hitch kit
71-60-2-185-557 trim piece kit
71-60-0-413-358 ball mount kit

All was going well with the install till I got to the wiring.

1. Both of my wheel well passthroughs are taken, as shown in attachment 1.
2. The convenience antenna two wire connector and the six-pin PDC connector that goes to the sensors on the bumper fascia go through the pass through on the right (see attachments 2,3 of the connectors on the harness and the connector on the fascia.)
3. I feed the PDC/comfort harness through he passthrough into the wheel well as indicated in the instructions.
4. I feed the harness from the trailer hitch kit through the pass through.
5. I hook the old comfort antenna two-wire connector to the trailer harness in the wheel well, and hook the other end of the passthrough on the trailer harness (near the hitch) to the antenna; and, I hook the three pin BUS connector on the trailer harness to the car harness in the wheel well.
6. The problem I have is, there is no provision on the trailer harness to pass through the wiring for the PDC sensors on the bumper fascia (the six pin connector)! The instructions make it sound like it should be obvious/simple, but I don't see any way to make this work. Even if there was some way to pass the wire back through the wheel well, the PDC/comfort harness (now hooked to the pass through on the trailer harness) is not long enough to reach the fascia connector.

I'm obviously missing something, it appears I have all the right parts. How do I get the PDC sensors connected? If I can't figure it out, I'm going to have to take the whole mess to the dealer (who will surely charge the "you tried it first" premium...).

Any help appreciated!