Fuses....con-fused!

[SupraSaver87]

I was looking under the hood of my car yesterday...and I noticed something. There is a fuse, a 30 amp, that is burned out. It is with the group of fuses that control my AC, ABS, and the 100 amp for my alternator. What I am wondering is what this fuse, that is burned out, does. It has the label CDS on the cover (Fuse box cover, which is under my hood, on the right side of the engine bay, when looking at the engine from the front of the car)

I am kinda wondering what this fuse does...and don't really want to replace it, because if it enables something that is busted....then I could be out a car for a couple weeks while its getting fixed....I need to go to work.

So I want to research what it does, and see if it would be worth it to me to put a new one in.

Please if anyone knows what I am talking about, post it here!