rx858

So I have a problem with the stereo. The factory stereo crapped out on me a while back and it stopped reading CDs. So I purchased a used one online but it won't work. I checked all the fuses and the only one that was blown is the #11 20a fuse that's on the inside. I changed it out and still nothing. The only thing that woks is the fan and the hazard lights. All the fuses under the hood are good. The only one I can think it might be is the acc relay that's next to the fuses under the hood. I've been looking around on the forums looking for an answer but I can't find what I'm looking for. Any help would be great.