I have tested all the door switches and they appear fine, although the nature of intermitant problems means there could still be a problem with a switch.

Also, the lights do not come on and off when the car is parked, as one would assume they would if it was a switch problem. If the switch is bad, it should be bad with the car off or on, and that is not the case.

Are these on a dedicated circuit design or a "bus" type configuration?

Thanks again.