The absence of the room (overhead, ceiling) lights and the step lights are a key. Fix the lighting issue and the others will probably start working again. Fuse #8, 20 Amps, in the engine compartment fuse box. On page 12-8 of your 2006 Owners Manual it might be identified as "Backup light". (Yes, strange . . .)Also noticed that my overhead lights don't turn on or the doors now that you mention it.
It's better to test fuses for continuity using a multi-meter or just replace it with a known good one.