I replaced the wiper PC Board in my 98 Chevy and my wipers work great. All that needs to be done is remove 3 screws, pop the cover off, remove old board and replace with new one and then add sealant to cover and reinstall with supplied screws.
This link at autozone can show you alot better than I can tell you hope it helps.
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/19/93/61/0900823d80199361.jsp