I wish I had seen this earlier - I had the same problem checked fuse 30 (as per the hand book) and then spent all day in the freezing cold stripping the car to check the wiper motor and switch which were both OK. At this stage I was completely baffled. After reeading this post I checked fuse 33 (the handbook says auxiliary heater, air conditioning - which were both working) and it was blown. I replaced it and the wipers worked. Many thanks