Actually for that model, the light is designed to stay on if the switch for the "Low Ambient Temperature" is on. The switch is located in the freezer door frame, upper right corner. There are 2 switches there. One for Low ambient temps and one for climate control. The climate control operates a warming heater around the perimietr of the door frame to help eliminate moisture in humid conditions and the low ambient temp control the interior light. On so the fridge doesn't get too cold when the ambient temp is cold and you don't want the fridge section to act as a freezer.