I tried buying the BMW wiring harness for my trailer hitch, but they are all sold out. I am going to order the proper towing module, but I got an aftermarket 7 pin trailer connector and did my own wiring. I took pictures of how I did everything and will post them soon.

But I need to know if anyone has the pinout for the connector that is inside the trunk, behind the passenger compartment (where the fuse panel is located). I have the wires from the trailer connector inside the trunk and was going to connect them to the factory wiring harness with some butt splices.

There are 12 wires. I'm assuming that 6 wires are grounds, and the other 6 are tail lights, backup lights, right and left turns, electric brake controller, and power. Each with a matching ground wire. I just need to know what each wire is.

Can anyone help me? I've already searched the forums and it looks like no one else has done this yet. I have attached pictures of the connector that I'm talking about.

Attached Images