What is a pulse module and how do i change it?

I have a 1990 S10 blazer and the wipers dont turn off. SO i have to take a fuse out when i dont need to have them on. I have been told that its the pulse module thats bad and that's why i cant turn them off from the coulmn. So 1st question. Is that what it is? 2nd question I found a pulse module for 30 dollars so how do i change it? Is there any soldering involved, or is it just unplug the old one and plug in the new one? This is really pissing me off so i would appreciate any help. Thanks...

Didn't you post this same message in the S10 forum?

Yes, yes i did. Why did you reply if you didnt know the answer? I just thought i'd post it somewhere else to ensure the widest dissemination...