One assumes you mean the windscreen wiper.
What problem are you having with it?
Talking the trouble to do the Google search YOU could have done, I find these:
http://uk-mkivs.net/topic/41583-wipers-not-working/ (Includes useful looking photo)
https://www.youtube.com/watch?v=4JxESGPyM0k (Check the comments)
http://www.vwaudiforum.co.uk/forum/showthread.php/7627-MkIV-Golf-Wipers-Dead-Slow-on-all-Settings (describes common problem)
http://www.diynot.com/diy/threads/vw-golf-mk4-2001-wiper-problem.133640/ (describes common problem)