To the best of my knowledge the dome light on a 2000 has no control box - unless your interpretation of dome light differs from mine, so let's clear that up as the first step - you say "dome light", I think interior light on ceiling.
Next - the dome light has two controls, the first of which is a switch on the dome light itself, and that over rides the second, which is the door switch(es). If you cannot turn the dome light on from the switch on it, you have one of the following problems - a blown fuse, a blown bulb, a defective dome light fixture or a missing ground. Get a DVM or test lamp, open the dome light and start checking.