I'm getting power to the CD changer but when I try to play it it displays something like "EE" and doesn't do anything. Also, my cruise control stopped working at the same time. I noticed this after recently R&R my supercharger. I changed plugs recently and observed things while at it .....all the cruise control stuff looks intact. I didn't install the CD changer myself so not sure on that one. Any ideas? I checked fuses and the ones that look normal are fine, what are the big black boxes in the fuse box? ...are those some other type of fuse that may be blown?

I find it odd that both problems would happen at once, it must be something I've done while R&R the supercharger, but what?