OK I give up!

Just as soon as I think I've figured out the cool feature of being able to roll up all the windows (or roll them down) from outside the driver's door with the door lock, it doesn't work.

Would someone shed light on how these feature works?

Is there anything influencing the function, such as taking the key out and locking and then relocking?

Why is it that sometimes I can roll down all the windows ... and other times I can't? It is great to be able to have all the windows go down before getting into a hot car.

Thanks in advance.

__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)