Where can I find the power distribution box of a 1997 Cadillac SLS?

My air conditioning in the front of the vehicle has not been working for over a week. I need to find the power distribution box so I can see if I have a blown fuse. In most vehicles the PDB is located around the battery, but this is not the case with my Cadillac. A Haynes repair book I bought says that the box can be found sometimes either in the trunk or under one of the seats. I can't find it anywhere.|||I like Chiltons better than Haynes. The library will have them. Have a look.