Atlas Trailer Hitch wiring for 7 pin connector

I have a 2018 VW Alas, it did not have the factory tow package, I have installed VW receiver hitch and the pictured VW Trailer Hitch Electrical Installation Kit. It works just fine and the car was coded to recognize a trailer. This kit is for use with the 4 wire flat plug. My hitch has the 7 pin wiring harness but it is not connected. I want to replace the 4 pin harness with the 7 pin harness so I can tow a small camper which is equipped with trailer brakes and the 7 pin connector. I also have the wiring harness for the 7 pin connector which came with the tow bar but it is not connected to anything. The harness that came with my hitch has the 7 pin connector on one end and the other end 2 connectors, one is long enough to reach the module that came with the kit and has a plug which looks to fit into the module, this plug has 5 wires: 12v power, Reverse, Right turn/brake, Left turn/brake, and running lights. The other plug only has 2 wires going back to the area where the module is, one will be for the ground and the other is for the brake controller. There is a ground screw back there but I can't find anywhere back there to plug the wire for the brake controller in. I am worried that there might not be a wire back there for the brake controller since it did not have a tow package. I can see them leaving out the module in cars without the factory tow package but I would think the cars wiring harness would be the same and there would be a wire for the brake controller. I wish I had access to a car with the factory hitch to see where the controller wire is on it.
, that leaves the shorter part of the harness that plugs in I don't know where.