A vehicle accessory assembly is disclosed for mounting on an interior panel, such as on a visor, for example, and includes an accessory devce, such as a vanity mirror assembly, interconnected with the visor or other vehicle panel at a generally fixed location thereon. A preferred laterally sliding accessory door is interconnected with the visor or other interior panel for selective lateral movement between a closed position wherein the accessory device is substantially covered and an open position wherein the accessory device is substantially exposed. Preferably, a switch is provided for electrically energizing a light or other electrical component in response to movement of the accessory door from its closed to its open position, and a manually operable override feature is also preferably provided in the event that the user wishes to disable the switch and prevent such energization in response to the opening movement of the door. In addition, the assembly can also be provided with other features, such as a disconnect switch that disconnects the electrical system of the accessory assembly whenever the visor or other vehicle panel is moved to a predetermined position.