OK - my BAD! The lights that will NOT turn off are the lo-intensity "night" lights as opposed to the Warning Lights (for lack of a better term). So the back-lit icons around the light switch, the seat position buttons in the doors, the dash vent, etc. Now that I think about it, I'm not sure about the heater panel buttons. I can check after the sun goes down.

All the red & yellow dash warning lights turn off. All the exterior lamps turn off.

Anyway, does that sound like a ground connection? While I'm thinking out-loud, are these all connected to the dash rheostat? Could that be the culprit? How would turning OFF the light switch NOT turn power off to the rheostat?

Oh, bother !!