Interior and Courtesy Lights Not Coming on

[appatight]

Hello all! I'm having a little trouble with the lighting in my 2001 Tahoe. None of the interior lights come on when I open the doors. All the lights still work such as the dome lights and everything because they come on when I user the dim control. I checked the dome override and it was in it's correct positioning. I'm assuming it has something to do with the door triggering... maybe like a fuse or something. The lights will not come on with any of the doors opening... not even if I open the hatch door none of them come on. So I'm assuming it may have something to do with a fuse (at least I hope). The only thing that sort of puzzles me is that I know that the truck knows when the door is open because I will get the the door ajar light in the message center when a door is open. The stereo still shuts off when the car is off and you open the door. The only thing is the dome lights and courtesy lights. I don't have a fuse diagram so can anyone suggest which fuse to check and anything else that I can possible check for the error. Thanks in advance guys.