What is the purpose of a 40A cartridge fuse?

There are 5, 40-amp fuses in this car, can you check to see which one it is I found wiring diagrams of the fuses if you want to check it out. This guide check help as well:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.