Read *almost* the entire thread regarding the MY18s and wasn't entirely sure: do the low-line NA LEDs have the same connector as the high-line dynamics?
As in: are the two plug and play or is the harness still required? I've got an 18 with the tails coming and just need to know if I have to spend hours trying to route wiring.
TIA.
You're asking two questions here. First, I don't believe the US plug will fit into the Euro light without removing the tab on the US plug. I don't know for certain because I don't have a US MY18 car, but it looks that way in the pictures I've seen.
Second, the US car does not have enough wires from the BCM to control each Euro light function individually as does a Euro spec car. The harnesses being used essentially send a single wire's electrical signal to more than one light, essentially freeing up a wire to reassign to another task. For example, both reverse lights are linked together, red inner hatch taillights are linked together, brake lights are linked. Linking them all together frees up wires to reassign to the blinkers, fog light, etc. I don't have a harness so don't know the exact linking combinations but it's not really different from the original LED harness so it's easy to assume.
So, you either need to route all the correct wires from the BCM to the rear where you have Euro spec functionality, or buy a harness which gives the effect but without design functionality. The harnesses you could buy have a female US plug at one end and the male Euro plug at the other end for the correct fit.
I have a 2016 Golf R and I ran all the wires from the BCM to the rear for my original LED upgrade, it took about eight hours but I have full and complete functionality as would a Euro car. For me, installing the facelift lights will require new connectors, a couple of wires from the outer lights to the hatch lights, plus some new VCDS coding.