The dome lights don't come on when doors are opened. The door switches seem to work o.k.and the lights can be turned on manually, so I assume the dash toggle switch is bad. I checked fuses and they seem to be O.K. How difficult to replace switch? Does the dash have to be removed to get at? Any other suggestions to try?

First thing make sure the main switch is in the middle (door) position. and yes, if the switch has an open circuit in the middle position it would cause this concern. The entry lighting system is controlled by a control unit (MICU) which is integrated into the under-dash fuse box. When you turn the main switch on or on individually at each light it electrically bypass the control unit and goes straight to ground. If the lights work manually than you know the fuse is good. For some reason the control unit may not be turning the lights on, due to a possible bad input to the control unit or a bad control unit itself. Check those door switches for open circuits and see if the lights come on if you open another door. If they do, the problem is the drivers door switch and this is the most common failure I've seen, but this effects drivers door only. Its unlikely that all the door switches went out at once. The center dash panel is held in by clips so you'll have to pry the panel out. take care not to scratch the panel. wrap a pocket screw driver with electrical tape or get a plastic trim tool. -hope this helps