2003 monte carlo LS, instrument panel lights not illuminating. The headlights function, all exterior bulbs working. Turning the headlight knob to ajdust the brightness of the lights does not change or cause a flicker with the brightness of dashbulbs. The IP section that displays the PRND123 is only partialy visable and is about 25% as bright as normal. I looked in the owners manual and that lists only 2 fuses that have anything to do with the IP lights. Both of these fuses were in the fusebox on the passenger side of the dashboard. One fuse listed as IP and front side marker lights, ( front side marker lights function) and the second fuse listed IP / interior footwell. Interior footwell and overhead lights function. I know the owners manual is not the same a service manual, but is a place to start. All fuses, on both sides of the dash board and under the hood checked good. A weird thing that may or may not be related. If the climate control fan is in the dash vent postiton, press the button for external air instead of recycled air, and have the AC button on, pushing in the rear defroster button turns off the indicator lights for the external air and the AC buttons. So maybe there is an issue with body control module? I should be able to get a wiring diagram either on line or tomarrow from the library. I am not sure if it some thing as basic as the headlight switch since the brightness used to be adjustable, or if the body control module is somehow in the circuit. Any thoughts?