Can't remember what module my door controllers are. I can find out from my VCDS scan if you need me to.
I also have a 2005 GTI and ran into the same problem as you. After a bit of searching the web I found the answer. Dunno where but I do have photos of my wiring set ups.
The first is the passenger door and the second is the driver's door. Mine is a four door but don't have photos of the rear, but once again they ar not the same as the bold sport guide. I remember for the rears door skin removal is necessary as the ground goes to the door lock ground.
Looks from the photos that passenger side goes to pin 1 and 4. Drivers side is the same but you have to splice into the existing ground on 4.