If I recall, the rear cabin lights only operate when you open the rear doors.

You can check to see that the bulb is not shot with the switches in the front of the car up by the rearview mirror.

From the manual: The switch with the door symbol is the lamp override - pressing the right side of the switch (the symbol side) disables the interior lamps and they will no longer operate when you open the doors. Make sure that this switch is not pressed (push the blank side of the switch to disable this feature).

The switch with the bulb symbol closest to the front of the car turns on and off the front interior lamps when you're in the car with the doors closed.

The switch with the bulb symbol closest to the front of the car turns on and off the rear interior lamps when you're in the car with the doors closed.

If that switch has no effect on the rear interior lamps, I'd check the bulb.

The interior lamps are all on the same fuse, so if any work, all should.