Looking for a 2018/19 update. The HARNESS...for adding LED Dynamic tail lights? DOES VW...manufacture this piece? All I see here is info for non-VW manufacturing of the harness. I'm sure they work and there's nothing wrong w/them...but if I CAN install an OE harness...I will. Is there an OEM part# for it?
There is no "official" harness from VW for this functionality.
The only way to get this to work from VW is the run all the wires from the tail lights to the BCM located at the front of the car. The reason for this is because the number of pins that we have in our NAR tail lights (at least pre facelift) are much lower than the amount from the European cars.
The harnesses that we are using allow us to remap the pins that are currently available to perform a subset of what the LED tails are capable of. If I understand it correctly, the subset of functionality allows us to use the basic tail light functions.
Other functionality and light patterns can only be achieved if you run all the required wires from the lights to the BCM and complete the coding.