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could be the micro-switch where the passenger side roof pin goes in above the visors. you can look in and see it. there are a couple of screws in the over head lights. you have to go through the lens. a 12" plastic wedge to pry the lens open on the back side toward the rear of the car. use something that won't scratch. remove visors and pull straight back on the trim, don't pull down. it's held on with glued on clips. I had to re-glue them with "Goop" automotive. be careful of the wires still attached. that would be a cheap and easy place to start for your problem.