Ok... confession. Rather, a mea culpa to those who burned brain-calories offering me t'shooting advice with this problem...

a'hem...
Turns out there are zero issues with Sonata's windows. The "one-touch operation" feature works perfectly.
I know this because ten minutes ago I checked the window switches myself. e'yup... ten minutes prior to sending this message.

<plaintive sigh>

I recently bought this car for my teenage daughter. She brought to my attention the window problem as part of a list of other, similarly minor issues (one concerning exception: transmission judder at rolling idle). Her mother allegedly confirmed the problem as well.

I broke a cardinal rule of investigating problem reports: confirm firsthand the problem exists as reported. As a professional troubleshooter, I know better; I neglected to verify that the Sonata window switches behaved as these females claimed. (I mean, c'mon... who doesn't know how to operate a car window..?)

Thanks to each of you for your excellent t'shooting suggestions. I'm certain I'll post again regarding some other vexation.

Thanks for sharing that update with us .
You gotta be testing us ,
Regardless, welcome to the club ! As stated we all get burned sometimes and there is nothing like getting it from family!

Hey, all is good! After all you found the solution to just about any problem: you got to know whom to blame! ;-)

TIL: one can have a "preferred junkyard".

<chortle>