I remember that when people have asked for advise on the rear window not working the first response is always is the rear wiper fully home. now the other day it was raining and i just happend to switch of the ignition mid wipe and when i went round the back to get somthing out the back i put the key in and turned it and the wiper went home then the windsow started to open ?
curious i thought is this the same for all the makes?

 

Mine does that too, pretty cool. Don't know about other makes though.

Steve