Hello Gents,
Yesterday I've found this thread and it Was very helpful for me to start my first retrofit job
I have MY17 FL A3, and I'm missing AH, so decided to do something about it.
I've started from buying used button and new cable:
https://www.aliexpress.com/i/4000833199569.html
By the way, button came out kinda wrong, because it has red backlit instead a white one which is in my car, but i assume this is not a problem.
Everything went by the book, but I had two issues and unfortunatelly AH still don't work for me.
Let me tell you what i've done:
1. I've soldered 2 cables from AH wires to Parking Brake button (here the collors was good)
2. Then put the red/white cable to the new 5A Fuse.
3. Put wires to ABS control unit - here starts the problem, I had different colors on cables. One what yellow/green and the other one kinda brown/grey. I pluged the yellow/green to 23 pin, and the other one to 32.
4. When I've tried to do adaptions/coding next thing went wrong. Enabling Auto Hold and Auto Hold Fuse went ok, but when I've tried to do coding, Byte 08 and 19 has changed, but changing Byte 23 gives me and Error 31.
And now, Auto Hold button has only backlit and nothing else is happening.
Here, I've also found a scheme with my colors of wires:
https://forums.ross-tech.com/showthread.php?18256-Audi-A3-8V-facelift-AUTO-HOLD-retrofit/page2
But it seems to be pluged in pins 35 and 43.
My ABS part number is 5Q0-614-517-BJ
Can anyone give me some hints about solving the problem?