it happened to my SL yesterday. The dashboard became dark. I replaced fuse No. 7 and all lights on this fuse are working ie: Right: tail light, parking light, license plate, BUT NOT the dashboard lights and the map light and the heater levers light.
Based on this thread I suspect the rheostat.
Could it be something else?
Is the only way to get to the rheostat to fix the problem by taking out ALL the instruments to get to the rheostat?
Thanks