Tough answer without seeing the light but here is for a 2004 Caravan "To change the dome light on a Caravan,slip a thin object like a flat-edge screwdriver under the silver frame and GENTLY pry off. The white plastic cover is attached to the silver frame with a couple of plastic tabs. Once this assembly is hanging down from the ceiling, the bulb can be accessed and replaced. To put the cover back, simply replace the white cover in the silver frame and push firmly into the ceiling until you hear it click into place
http://autoforum.classifieds1000.com/Dodge-Grand_Caravan/2006_Overhead_Console_Removal hope this helps and good luck.