Instrument Panel Illumination

Voltage is supplied at all times from the CTSY Fuse to the Courtesy Lamp, Dome Lamp and I/P Compartment Box Lamp. The Courtesy and Dome Lamps turn on when a ground path is provided by the Panel Dimmer Switch or one of the Door Jamb Switches.
The I/P Compartment Box and Vanity Lamps have their own switches that provide ground paths when their switches close.