Alright, there'* a couple different components that need to be looked at in addition to the above suggestions. The INT LP Relay (#51) in the rear fuse block could have failed. The Rear integration Module (RIM) controls operation of the INT LP Relay based on input (serial bus) from the Driver Door Module (DDM), the DDM comunicates with the 3 other door modules to status which door is open/shut. So, you can see things are not that simple anymore. Just about everything is processor controlled. Did you try to turn the interior lights on manually? All interior lights are inoperable? A quick check would be to interchange the relay with another one of the same type & like Jim C. called out, check fuse #27 at the rear fuse block.
2003 SSEi, Light Bronzemist Metallic - All Stock For Now
IBEW Local 261 Groton, CT
My other vehicle is a nuclear submarine.