Usually this will happen if you've already disconnected the battery. Often it takes time for everything to reload. But it's been since Oct. so this seems odd. You could def try it and see what happens. Can't hurt.
See post #4 lolTry a Factory Reset on the Radio Settings Menu with the button in the run position TWICE and cycle the button to OFF between resets. You can also cycle the radio fuse in the back fuse box... F31 ??