Not sure where a fuse or breaker for that would be unless it's in concert with the porch light circuit. Try your porch light to see. If it is out also, the 12v porch light fuse is one of the spade ones in the square black box subset into the bathroom wall with the multiplex and alternating current Main and Inverter boxes. There is also a porch light relay in the electric bay, drivers side front, relay # K23 on my '06 Monterey. Check its connections and keep in mind relays often go bad.
Otherwise, these handle lights don't last forever. One of ours started flickering and hadn't been used all that much. BCS replaced it. So it's possible all of your lamps need changing out.
Joel