As you already know, the DRL from the front bumper becomes the Fog Light.
Found this on CS: http://www.carsystems.pl/vw-polo-6c-fog ... d2161.html (unless you want to do your own wiring)
Also found that under T46b connector, slots 3 and 40 are responsible for the Right and Left Fog bulbs ( in that order ), so now we know what goes where.
As for the tiny blue cable, it runs from your T10k/5 (Rotary Light Switch) towards T73c/31 ( front / rear fog light switch ) ( but is most likely not needed, as there is already a wire there for the rear fog lights. Someone could explain that scheme better, if possible, as I am not sure about the blue cable )
https://imgur.com/S7AUzdh - BCM --> Fog Light Bulbs
https://imgur.com/X5Yf2Y3 - Rotary Light Switch ---> BCM
https://imgur.com/kmO2Fwk - BCM slot
** Note that I made this from the back of my head by just looking at the wiring Diagrams, feel free to correct.
Will be back with the more info and pictures once done
![Smile :)](./images/smilies/icon_smile.gif)