1994 E320 Cabriolet Passenger Window Question

[87tdwagen]

Dear all:
I finally bit the bullet and got me a sweet low mile 1994 Cabriolet to add to the stables, a Polar white with parchment cladding, blue top and light grey interior. Rides like a dream, better than the S124 surprisingly given the shorter weelbase, but if feels like a 3 ton block of steel floating on a cloud

Anywho...I do have a rather unique "feature" that I'm not sure if was intended by the good engineers at MB. Seems as the passenger door window does not want to go down upon putting the keys in ign or starting the car, unless...

1. I repeat, take key completely out and then power pass window down before starting the car.
2. Use the Top-Down button and all windows go down and function normally.
3. Use the master key in the drivers door to operate full open, full close.
nope nary a problem.

Only when I get in the car and just want to lower the passenger window does it not work

I thought it may be the window switch contact, but when it does work in steps 1-3 above, it functions fine, up/down etc. so I ruled out the window switch as it does function.

So I assume my problem is with the brains, (I often get this comment) or some switch somewhere that is not letting the convenience control module know that all I want is my window to just open when I hit the switch... is this too much to ask??

Ideas?