Not sure how exactly it was miswired but sent my pinouts via voltmeter continuity checks to A2B and Billy there confirmed it was an issue. Basically my brand new OEM Audi RS3 pump wouldn't prime/turn on and I was getting an engine code related to the fuel pump circuit, my external ground was very solid on bare metal. It is the exact same harness they bundle with their main RS3 brushless kits so I wouldn't worry about it and sounds like mine was an anomaly. At this point, they are sending me a new harness. Like it was mentioned above, the retrofit harness is based off 8V0971727A but I could never find how it was re-pinned for the GTI conversion.
Yea the flat shipping cost is high but I still came out way cheaper than buying the overall kit by sourcing my own pump/controller so it's all good. Unless someone wants to publish a specific guide on how to take that OEM harness and mod it for FWD/AWD MK7 along with a list of parts like the pump plug/pigtail, then A2B DIY harness is still the best way to go.
The parts list exists. I'm all for companies making money as long as they do it well. I'm hoping my harness works as it should and my time is not wasted. If it is, there may be a DIY guide that will be published with pinout information and part numbers. This is really very easy stuff. Getting the parts is a little difficult (some of it is back ordered) but people would be able to build the stuff themselves and make sure it's right. There is no excuse for this harness being pinned wrong. Nobody should need to worry if their harness is pinned wrong. Mine just got delivered so I'll be checking it tonight or tomorrow with a volt meter.
I see @scrllock posted the pin out. Check your harnesses guys.
Awesome thanks, looks like they completely reversed my RS3 pump top hat wires based on my harness pinouts so for now I'll re-pin them myself to get them in the right order (ie my top hat ground is pin 1 not 4, all reversed 1-4 based on controller connections to the RS3 top hat).
Assuming that is the main issue then that was a waste of about two nights of troubleshooting and two weeks of back and forth emails. Agreed that's a pretty egregious problem for a 6-wire harness. Wish they would've told me that two weeks ago when I sent them my pinouts to just say sorry de-pin and reverse those and you'll be good.
Edit: Re-pinned the A2B DIY harness on my own and re-installed the RS3 pump, everything is now working as intended.
Awesome thanks, looks like they completely reversed my RS3 pump top hat wires based on my harness pinouts so for now I'll re-pin them myself to get them in the right order (ie my top hat ground is pin 1 not 4, all reversed 1-4 based on controller connections to the RS3 top hat).
Assuming that is the main issue then that was a waste of about two nights of troubleshooting and two weeks of back and forth emails. Agreed that's a pretty egregious problem for a 6-wire harness. Wish they would've told me that two weeks ago when I sent them my pinouts to just say sorry de-pin and reverse those and you'll be good.
Edit: Re-pinned the A2B DIY harness on my own and re-installed the RS3 pump, everything is now working as intended.
Yes the kit comes with the jet pump connector and the float sensor harness. The float harness isn't a plug and play one like the EQT one is though. The float pigtail needs to be spliced in to the stock wiring harness from the driver side level sensor.
My A2B connector didn't come with the slide lock for the controller connector. I'm not sure if it's the same as the one that's on the car already, but I just took it off a OEM RS3 harness I had laying around. It would be really disappointing if the lock was not the same as the one that's already on the car.
The harness you're supposed to get is 8V0971727A . Going to be easier to just buy A2B's DIY harness and check the pin outs once you get it but I believe it is based off that SKU.
8V0971727A - harness, but you still need to re-pin and figure out the float pigtail + fuel connector. easier to just buy the A2B kit + the above 2 part numbers. you can get the controller cheaply on ebay.
Are you able to go into more detail on the re-pinning? Is that only required for the FWD cars, or do all Golfs need to have the RS3 harness modified (per your diagram)?
Edit: Also, is there any way to source the plug inside the tank and a suction pump hose connector? I guess the extra bits that come with the A2B harness
Are you able to go into more detail on the re-pinning? Is that only required for the FWD cars, or do all Golfs need to have the RS3 harness modified (per your diagram)?
Edit: Also, is there any way to source the plug inside the tank and a suction pump hose connector? I guess the extra bits that come with the A2B harness
The difference on FWD cars is they don't have a driver-side float to connect/splice in (it's a connector on the bottom side of the top hat). The BCM->controller wiring is the same.
I don't know of anyone who's selling the plug and hose connector. It's not super hard to fabricate, but I have no idea about the connectors.
The harness you're supposed to get is 8V0971727A . Going to be easier to just buy A2B's DIY harness and check the pin outs once you get it but I believe it is based off that SKU.
Well the whole thing is I bought the A2B RS3 Pump/Controller/Harness kit a while back with the old controller/harness but after I tried install it, it turned out either the harness or controller were bad. I contacted A2B for support and they said they will sell me the new black controller with harness for a discounted price since they don't support the older controller or harness anymore. I was happy and agreed, but I don't know what happened after that because they stopped responding to my emails and I've gotten the runaround when calling them. So It's been a month and a half since last contact so I just stopped dealing with them and just going to modify the older harness with the new plug and I bought the new controller locally from the dealer. Maybe I can source a plug with the pins on ebay, but thanks for the info I'll definitely look at the harness if I can't find the plug.
