[jdmccright]

If your car is anything similar to my Camry, there are plunger switches hidden under black rubber covers on each door frame. The copper contacts inside them oxidize, preventing the switch from closing the circuit. I've had to disassemble each one and clean them, using a spot of hot glue to hold the switch casing closed.

Also, I have noticed that the bulb used in the dome light tends to form white oxidation at the metal ends, also preventing a closed circuit. A little light rubbing with a scouring pad should clean it off.

Clean the blub contacts first, then give each of the switches a little wiggle with your finger and see if the light winks on...if so, it's the switches. If you have a camera, post a pic of the switch and I can confirm they are the same. If so, I can offer more detailed instructions on how to dissassemble and clean them. Hope this helps!