Looking to do this retrofit, have installed the loom in the bumper and mirrors, but trying to understand the second 12 pin plug from the bumper wire-loom. Do you have any wiring diagram from your install or the pin layout of what goes to the each door and the button in the a pillar. Any assistance would be grateful. ThanksI know, it is going on for a long time, but I think that I see the light at the end of the tunnel.
All missing parts, the tray for the B&o amp, the missing harness for the side assist (running on the pass. side of the car to the front, 2 wires going to the pass. door, 2 wires the can interface (extended) and 5 wires going to the driver door, its all on the way.
Will have to to take the bumper off again since a have the wrong harness. Should be a piece of cake now since my last attempt.
The harness we need (in the US) has 2 connectors, 1 to connect to the pass-side-cont(roll-unit) (see picture). The 2nd connector than connects to the above mentioned harness.
One more tip I got from Germany is that, if you are using the original wiring (I could not even think not using it !) for the B&O system that there is absolutely no margin in regard to the placement of the wiring inside the interior, you give it a little more slack at the main connector to the amp and the rest of the wiring will be to short everywhere else. That the reason I did not start yet with the installation yet.
Will be back soon.