Just picked up a used 2007 edge sel plus. I noticed on the way home the backlight on the radio didn't work. Then I tried the steering wheel audio controls and they didn't work. I also couldn't find the satellite radio button on the radio either, even though there is an antenna. I am guessing whoever had it before sold the upgraded radio and replaced it with the standard one before trading it in? Can anyone help comfirm this? Thanks!