Ok, if you have a coupe, the light on the left side of the cargo area/trunk should illuminate when the liftgate is open or when you press the button for the overhead light (by the rear view mirror). If you press the button and it comes on, then the liftgate switch could be bad. If it does not illuminate, and the bulb is definitely good, then a fuse might be blown. However, I believe that light is on the same fuse as the overhead interior lights.