I had exactly the same problem occur on Thursday for the second time .
Non operating door latch, window and rear wash/wipe.
I had the same problem almost two years ago to the day.
I checked both fuses and could here the window down relay coil engaging and the micro switch in the rear handle also operated.
After disconnecting the battery for 5 minutes the and then reconnecting the rear window should power down upon connection , mine didn't , but the latch mechanism now works again as does the wash/wipe.
I now should be able to carefully prise the window out from under the plastic trim which will allow me access to remove the rear tailgate and 1/4 panels to check the relay contacts , earths, cable harness and regulator cable .
Unfortunatly the weather is appalling over here in SW Ireland so it has been put off until it improves.
There is a overide function that allows you to self check most of the component functions from the CCU . I picked it up on another FL site so as to avoid upsetting any of the mods on here if you pm me I'll forward the link for you to try.
Keep us updated if you rectify the fault as I will to .
Good luck