I have 2004 Chevy Trailblazer Ext, the fuse blew and I am not sure where to locate the fuse box. One of the outlets was under the hood but the other outlet may be in a different place?
So you are right, the fusebox is located under the driver's seat. Under the side centre.
Just try to pull up the driver's seat and you will find a small black box under the car carpet.
You will need to remove the carpet and be able to reach the fuse.
Please try that. I am sure, it will work for you. I hope you know what you are doing with it though?
Actually for model year, the interior fuse box is located under the rear passenger seat on driver's side.