Both, that is a feature.  Special switch plus circuitry.  Sounds like the other 
switch that doesn't activate this feature is a replacement or needs a good 
cleaning.
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On August 7, 2017 10:27:33 PM EDT, Craig via Mercedes <mercedes@okiebenz.com> 
wrote:
>I mentioned earlier that when I received the 1990 300D/2.5 Turbo,
>momentarily pressing hard on the front passenger's window switch would
>open that window all the way.
>
>I tried an experiment and reversed the switches side-to-side.
>
>Now the driver's window is the one that automatically opens all the
>way.
>
>So the function goes with the switch. I don't know why -- I haven't
>looked
>into what causes the function -- but I'm curious whether it's something
>in the switch itself or some ancillary circuitry in the rest of the
>car.
>
>
>Craig
>
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