Installed the hitch on my 2010 E70 today...the threads here were very helpful.

Here are my observations...

The harness had 3 connectors that I could not find a home for...

1 - prewired brake controller - will be used once I connect my Tekonsha brake controller

2 – comfort access antenna base (near the hitch) – car does not have this option

3 – comfort access antenna (2pin connector, in the fuse area) – car does not have this option

The USB bus was overlooked on my part initially, but found the 3pin connector in the loom just under the tail light…

Overall, it took me 4.5 hours to complete…

HOWEVER, I am getting a restraint system warning on my NAV informing me that either the (airbag, belts or belt tensioner) is not operational. Not sure what this could be…

Will be talking the car to the dealer for troubleshooting and will the car reprogrammed for the trailer hitch…

NEXT, figure out how to connect the Tekonsha Prodigy P2 (carried over from my E53). It has four wires…one will go to the trailer harness brake controller connector (option noted above). However, the harness has four wires so I need to figure out which wire to connect to the brake controller…