It looks like you've either lost your 12v feed or the ground; which the light switch provides. There are a couple of tests that'll determine which one is missing. Using a multi-meter or a 12v test light, connect your RED test device lead (or test light probe) to a known 12v power source e.g., cigarette lighter, dome light bulb contact...etc. Now connect the black test lead to the ground terminal at the map light socket; we don't know which terminal is which but that doesn't matter at this point, we just want to establish that there IS a ground available from the switch.
If your meter (or test light) indicates that you have 12v then we know that the switch and ground are good but tells us that the power supply has dropped out. If there is NO indication that you have a ground up there, then you'll need to investigate it further! We'll cross that bridge when we come to it. In either event, prepare to remove that shiny silver upper console reflector for further exploration. You will also need to remove the HOT AT ALL TIMES courtesy light fuse located in the driver-side fusebox labeled DVL-2 25A.
NOTE: Please use caution when working in the upper console junction area as there are other fuses associated with this circuit! Cheers!