I managed to blow mine when using them to power a mains converter a few years back when camping. Mine is a 2002 TDi, so I can't guarantee it's the same.
As far as I remember on my car each outlet is separately fused. Looking at the diagram on the inside of the pull-down flap, it looks like:
"Cigarette lighter" in front console: fuse 7 (picture of a cigarette on the diagram).
Power outlets by rear door: 8 and 10 (pictures of 2-hole sockets on the diagram).
In my car all of these hold a 15amp fuse, although I can't guarantee this is right- I seem to remember pulling fuses without noting where they belonged, and neither the handbook nor the flap diagram gives fuse values.
Fuse 20 looks as though it could be relevant if the others don't solve the problem. I have a 20amp fuse in that.
Good luck
Paul Kingston, April 2007