2000 Ford Taurus Missing fuse

Hi all, and thanks for reading my post. I recently purchased this 2000 Ford Taurus Wagon. I was looking at the fuse box, and saw that one is missing. It is for something called "GEM Park Neutral Switch". I've looked online, but have not been able to learn what this is for. It is a 5 amp minifuse. I know that GEM is for Generic Electronic Module. The power mirrors on this car don't work, and I'm not sure why (it's nothing obvious). Can anyone tell me what this fuse is for, and if there's any reason someone may have removed it? Thanks!