I'm installing a trailer wiring harness, and I noticed a connector not plugged into anything (in the picture, the one with the purple wire going into it). I'm wondering, why is it not connected and what's it for? It's a 6 pin connector with only 4 pins populated, same as what's used for the taillights (although a different pin layout).


The connectors right above the blower fan

The connector closest to the left, with the purple wire

 

Oh and while I'm on the subject of mystery wires, here's another one - a cable (2 wires inside) going from the taillight connector, to a heatshrinked loop in the rear door. Maybe an antenna? It looks aftermarket, but I don't have any fancy radio or anything.



The loop of heatshrinked wire

The wire connects up by the taillight connector, and then goes down to the rear door passthrough

 

Purple Wire Connector - REAR WINDOW DEFROST .

 

The other wire, if factory, I would assume is for the license plate light, or rear camera.

 

Thanks!
For the other wire, I accidentally posted the same picture twice, I meant to post this one, of the wire loop. It just ends in a loop, and it's not connected to anything else.