Ok so we pretty much know that it is a part that is missing in the US vehicles that will allow for this option from the factory key fob. Is there a way to find out which part this is and how we can go about getting it? I feel as if it would be a bit more of a challenge to get a parts guy at a dealership to try and help out, especially if they think they won't be able to order the part and make the sale. My dealership parts guy tells me that any Euro part # is hard to aquire in a timely manner and sometimes will show as a pending order and never ship.

I'm wondering if it could be as simple as a missing relay and/ or fuse. The function for the windows/ roof down motion exist in both the lock core and key fob, but for the windows/ roof up motion exist in only the lock core and not the key fob. So the missing link is the signal from the fob but because the operation is still functional it leads me to want to check to see if it is possibly just a simple missing set of fuses or relays.

If we can find out what allows for the down feature maybe it will shed a bit of light on how this whole system works.