Start-Stop Button Wiring for Polo 6R BlueGT

[Paulpelz]

Hi all together!
I am currently working on an engine swap on my Polo 6R 2012. It's going from a crappy CGPB 44kw engine up to the CPTA 103kw engine from the Polo 6R BlueGT. And yes, I know it is a stupid idea and much more work than anticipated, but I am now too far in to change my mind, so this has to work!
Annoyingly, the wiring diagram out of Elsa is an absolute piece of crap: Important parts like the voltage stabilizer or the battery control unit are straight up missing, but those you can at least be adapted from the other engines with start-stop-system.
Worse, the wiring for the start-stop button J693 in the dash is straight up wrong, since not a single 6R has a start stop button with a T10 connector. The 6C CZEA (basically the same engine) wiring isn't helping either since this system seems to be controlled by the BCM instead of the ECU like in the 6R.

Is there someone amongst you who could help me? Maybe someone with a BlueGT could send me a picture of his/her T6 connector (with the wiring colours) at the button? I really don't want to potentially fry my ECU since these are terribly hard to find.

Thanks in advance!

[iichel]

What start/stop button does have a t10 connector?

[Paulpelz]

None, that's the problem. But the wiring diagram says 6R's with CPTA enginges have. Which ist definitely not true.
At first I guessed VW just copied parts of the Golf wiring over, because the set of buttons there does have a T10 but even this doesn't make any sense. It is just wrong, at least in my documents (that I downloaded from ELSA directly).

[iichel]

I'm pretty sure the czea wiring will be the same

[Paulpelz]

I don't think so, because while every single 6R seems to have the button connected to the ECU, the 6C (e.g. CZEA) has it connected to the BCM. As far as I know that is a difference between all PQ and MQB(ish) vehicles.
And since the CPTA (even though it is from the EA211 platform, so designed for MQB) was crammed into a PQ car, I think the button should still be connected to the ECU, because the BCM doesn't support the same functions as in a MQB car.
I hope you understand what I mean...

[iichel]

I can see where VW messed up:



So I'd suggest to go with this one:



and either connect the push botton to the wires indicated by the CPTA scheme, or follow 'old' TSI:

[Paulpelz]

Thanks for your suggestion, iichel!
I think I'll go with a hybrid of the old scheme on the button side and the new scheme on the ECU side.
The CPTA ECU and the CBZB/CBZC ECU seem to use the same T94 connector, but this is aready where the similarities end. They are competely different internally. At least they don't share any similarities in the wiring schemes.
I think this way I won't risk to kill my ECU, because even if I connect the two wires (T6/1 and T6/5) the wrong way round, there shouldn't be no more current than the ECU wouldn't be able to handle anyway. (Does this sentence make any sense? Whatever, it's late )

I will report if it worked as soon as I've tried it!