So you're fuse is fine? If it's not something simple like that then there is a step by step procedure in the GM service manual you need to go through to track down the problem. It will be too tedious and time consuming to go through this over the internet 1 day at a time though. I highly suggest getting a GM Chassis Service Manual. In fact, I highly suggest every person here to get one. Note a Chiltons or Haynes manual is NOT the same thing.