Help! 98 Bravada interior lights stay on

I have a 1998 Bravada and ocassionally, the interior lights stay on after I turn the car off and lock it. I have searched up and down the internet to diagnose this problem with no luck. I have resorted to keeping all the lights off via the dome over ride switch but I am getting ready to sell this car and that's the only thing wrong with it so I'd like to fix it for the next owner. I assume there's a switch or module somewhere that controls the interior lights and delay?

This is the 2nd Bravada I have owned and it has always been trouble free...it has been meticulously cared for and is one of the best cars I have ever owned. If anyone is looking for a good deal on a black on black 98 Bravada that's in excellent condition, in the western suburbs of Philly, feel free to contact me.

Check all of the pillar switches including the hatch. You'll either find one sticking, or there is a problem in the RAP (Retained Accessory Power) circuit.