Problem might be that one end of the spring sits on a small black piece of plastic which has popped out of position. I have NOT tried to actually fix the problem, yet, but just removed the bulb so that the battery doesn't drain.
3 screws need to be removed to see the black piece:
- With a very-thin, flat screwdriver CAREFULLY pry the lens-cover off; I don't suggest trying this if you can't do it gently since you might crack the cover. If you then look upward in the center of the uncovered area, you will see the screw that needs to be removed.
- Drop down the "sun-glasses compartment" and you will see the remaining 2 screws that need to be removed.
Finally, carefully disconnect at least 1 of the electrical harnesses.
You should see the small, black plastic piece in its correct position on the properly functioning light switch.