Im driving a 1.6 2004 A3 and the rear window wiper has stopped working, also i rear window wash isnt working!
Front window wipers and wash is working fine

Any ideas on what to look at?

Going to check the Fuse first...

 

where is the fuse box??? i thought it was at the side of the dashboard as you open the door!!

n00b

 

I have the same 2004 audi a3 1.6 and i'm having the same problem except i managed to fix the washer as there was just a blockage, so i took the small cap off the rear wiper and simply clean out the hole with a pin. It now works! the wiper still dont move though even though i tried physically moving it whilst it was on and could feel it trying to move.
Yes the fuse box which contains the rear wiper fuse is on the side of the dashboard on the drivers side when you open the door!

 

THis might be a bit of a longshot but i know the rear wiper doesn't work if the hatchback isn't engaged. Something back there?

 

what do you mean by 'hatchback isn't engaged'

 

You know when you close the trunk and it doesn't latch completely? (Usually you'll get a blinking trunk is open on the console). When the trunk hatch isn't fully engaged, the wiper does not work.