Check to see if you have reverse lights. If you don't there's a fuse inside the cabin that may have blown.
IIRC, the reverse lights and SRS light are connected in that sense (for whatever reason), so it may also be connected to the sunroof. If that fuse is blown, it trips the SRS light and you lose your reverse lights as well. I forget what fuse it is though, wait for someone else to chime in on that part.
Also be sure to check WHY that fuse may have blown before just popping a new one in.
