I'm still working on this but thought I would throw in some details and part numbers for anybody thinking about it. To begin with this I'm doing this on a 2015 Golf TDI S. As far as previously completed retrofits the only one I suspect might matter is Driving Profiles. The seller linked earlier in this thread still has it listed and I originally ordered from them. It never shipped and they did not respond to messages.
AliExpress auto-refunded me the full amount. I reached out to seller Aidu Auto (who is pretty responsive to messages) and asked if they had the harness. They don't have a listing up but sent me a custom invoice and shipped it out a day later. Fast forward to me having the harness in hand...
All the pins and colors match the
Erwin drawing... good. Noticed the wiring going to the rear level sensor (G76) breaks off with the Gateway wiring (driver foot/dash area)
. Well, it turns out this harness is built with the expectation that your car has auto-leveling headlights, and therefore already has the rear level sensor. And that sensor would be wired to the headlight range module (J745), which is under the steering wheel near the gateway. This harness would have you de-pin the three G76 wires from J745 and re-connect them to the harness going to the module (J250). User ZERO815 over on GolfMk7 clued me in that J250 would then make the rear level data available over the can bus (which the J745) could then use. My TDI S doesn't have G76 or J745 so I had to unwrap part of the harness and splice my own wiring in which goes directly from J250 to G76.
That also means the harness came without the 4 pin connector that is needed to connect to G76. The part number for that connector is
4B0 973 712 A. Source it from wherever, or find a 4 pin pigtail on
eBay, but make sure it is 712
A. Part number ...712 does not have the required alignment slot and you would have to use a blade to remove the alignment tab from the level sensor. This same part number is used to connect all three level sensors (front L/R and rear L).
Next issue is that all the 2 pin connectors on this harness are the same part number, 4F0 973 702. There are 7 of these; 4 for the dampers and 3 for the body accelerometers. These connectors have an alignment slot. For the dampers this alignment slot should be offset, towards pin 1. For the accelerometers this alignment slot should be centered, between the pins. Every connector on the harness has the slot offset. So, you can use a blade to "enlarge" the slot on the 3 accelerometer connectors allowing them to connect. Or you can order 3 replacement 2 pin connectors, PN 5K0 973 323. This part number will get you a yellow connector, like those on for the accelerometers that are used for crash sensing. Note that the accelerometers for crash sensing and the adaptive damping system are the same part number, 5Q0 959 651 (or 651B). I assume (but don't know) there is a non-yellow 2 pin connector part number with a centered slot but having yellow connectors is a non-issue to me.
Corrected info posted by @darkchina811 in the next few posts, I explained my confusion in post 153.
I'll update this post as/if I run into anymore issues, and will probably add the 47 pin connector part number in case someone prefers to custom build the entire harness. In my estimation buying the harness pre-built is the way to go. And those that
like building harnesses will still have a little fun fixing the minor issues.