When you open the cover to the passenger's visor vanity mirror, the lamp will turn on.

Your vehicle may also have a lighted driver's visor vanity mirror.

If your vehicle has this feature, each visor has two parts, so that both the windshield and door glass can be shaded at the same time. To use the dual sun visors, flip the first visor down and turn it toward the window. Then, flip the second visor down toward the windshield.