Quote:
Originally Posted by PAX5
Yes, I did the install. Took me a day-and-a-half to sort out and decide which way the wiring should go. I just sat on the ground, staring at the wires (having a beer or two) and rationalizing which way things should be connected, all the while reminding myself that BMW would not design something like this if it required cutting and splicing ... so:
Trailer harness goes through the left hole. Whatever is there now, should be traced, disconnected and pulled inside the wheel well. I believe that one side had CA and one side had PDC. I combined the two to come out of the right hole.
The new trailer harness with blue/black connector needs to be taken apart so that it will fit through the left hole going into the wheel well where it needs to connect to the AHM module.
Cap and tie the CA connector that is part of the trailer harness. You won't be using it.
You will use the CA and the PDC coming out of the right hole that was originally already connected to your car.
Follow the instructions as per attached PDF.
I discussed this with Daryl from Invishitch. He wrote the installation PDF.
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Brilliant! That was the missing piece. I think because the BMW manual was written in 2008, that was before the turbo (?), so it does not have the detail about the inner port having a vacuum hose in it. I have the turbo model, which has a vacuum controller to control the exhaust port. THAT is what is going through the inner port on mine (as described in the manual you attached, which is more up to date.) That tells me what that thing is on the inner pass through, it's a vacuum hose. So, now I know that I need to reroute that though the outer grommet using a fish wire, and VOILA! All is as it should be, and I have the inner port available to install the hitch harness. Bless you. If you come within pouring distance I owe you a beer.
So did you get the retrofit coding for the hitch and if so who did it and how much?