I've searched Google using s2ki & various parameters. Best "hint" was on a Toyota 4runner forum that implied there had been a "how-to" on s2ki with group buy of switches... but with s2ki search down, rather a lost cause for now.

It surely cannot be as simple as changing the switch..... other posts in the Electronic forum do indicate that for auto up/down switch takes a pulse feed from the motor to tell if it is still working to see if fully up/down before ending cycle, so wonder if that feed is there from passenger window motor?.....

Will have to wait until search is back.

 

My mum's old Prelude (E reg) had the same, as did my Civic VTi. I can only assume that it's a safety thing - ie the one sitting by the window isn't controlling the switch. Passenger could have their head out or something

Presumably there are cutoffs when certain restrictions are encountered though so that shouldn't be an issue these days.