I haven't got a Mk3 jazz, so this is a bit of a guess, but on my 2012 Jazz you can still open /close windows with the engine off as long as you do it within a set time - can't remember what it is off hand, but something like a minute or two. Also there is a switch on the door panel which acts as a child lock on rear window switches so that only driver can open/close rear windows. I would hope the Mk3 Jazz would retain these features, you may have to read your handbook to find out. On second thoughts , opening/closing windows after you have switched the engine off might only be for the drivers window, but I'm sitting indoors now, and it's cold outside so I'm not going to investigate further!