If it is equipped with the flipper glass the switch is above the license plate.

With the key.

It is more than likely an issue with the rear flipper glass switch. In the models with this feature, the sensor that detects the glass closed will break, causing the interior dome light to stay on.

To verify this, remove your rear (hatch) door panel and disconnect the wires going to the door glass switches. If this resolves your issue, you can purchase a new switch from a Jeep dealer.

The door switch or you may have one of the negitve wires that connect to the door switch touching ground.

One of three things usually fails on a rear defroster. The switch can fail (it should have a light within the switch which should be illuminated when turned on). The tabs can break off the rear glass. Or the lines have "worn" off the glass. Both of these should be able to be repaired by a glass company for a small expense.

One of three things usually fails on a rear defroster. The switch can fail (it should have a light within the switch which should be illuminated when turned on). The tabs can break off the rear glass. Or the lines have "worn" off the glass. Both of these should be able to be repaired by a glass company for a small expense.