Golf IV / Jetta IV :: 2002 - Wire Harness Missing In Sunroof

I own a 2002 GTI and my sunroof was damaged beyond repair.

A local headliner shop had a used 2004 Jetta sunroof which he sold to me. The shop owner said everything was in working order with the sunroof except the wire harness that runs to the sunroof was missing the plug since it was cut. He recommended just taking the plug from my GTI sunroof motor and soldering it onto the Jetta motor since it may throw off the "timing" of the sunroof motor and would need to be recalibrated if removed. Keep in mind he is an authorized Webasco dealer so I took him at his word.

I cut my plug off of my GTI sunroof motor harness and began to solder it onto the Jetta sunroof.

I quickly noticed the Jetta sunroof motor had one extra wire (Brown). I didn't think it would be a big deal since my GTI doesn't have 6 wires and only requires 5 so I mounted the new sunroof with the Jetta motor onto the car.

The sunroof retracted back into the "fully open" position and would close but would not go into the "vent" position. Each time I would turn the dial to the "vent" position, the sunroof would slide back into the "fully open" position.

I thought this was a bit strange and now I am beginning to wonder if I need to swap the GTI sunroof motor on my car due to it not have the extra wire or is the Jetta sunroof motor going to work fine but another issue is causing this to happen?

Below are the differences in the two sunroof motors. Both are Bosch products.

Jetta Sunroof Motor - Part Number : GDO 849 696 564

This part has 6 wires that connect to it.

White, Green, Gray, Blue, Purple, and Brown

Where as the GTI has only 5 wires on it.

GTI Sunroof Motor - Part Number : GDO 849 696 566

White, Green, Gray, Blue, and Purple

The difference between the two is the additional BROWN found in the Jetta sunroof motor.