You are pretty much down to the Dome light switch. Either burnt up or internally stuck on OFF. If that isn't the problem, there's got to be two problems in the circuit.

 

Schematic will help a lot. I'll keep a eye on this, I'll be able to help out on friday @ work. Sounds like something simple

 

Ill post the writing diagrams I have tonight. But other than my previous posts, only 2 simultaneus problems could cause this

 

Interesting revelation: When it's wet out, at least the dome light buttons work. Still no response from the switch. Hmm. Must have a break in the circuit somewhere.

 

I guess she likes it wet maybe get her wetter?

 

I'm having the same problem... I took apart the light assembly last night and it appears to be the 3 position switch causing the problem. It gets corroded and keeps the lights from working (which also prevents the keyless entry system from knowing I've opened a door and will lock it back after 30 seconds).

Luckily, you can disassemble the switch and clean the contacts, which fixed it for me. If need be, I'll try to take some picture of it tonight.

Someone beat me to it:

LINK