This is great to know. Someone on Utube posted an interesting diagnostic idea. It seem to work. He explained that when applying the switch to engage the motor it applies load to the circuit. He tested the switch using the overhead lamp, if the switch was working the light would dim slightly. It worked, kind of. In the up position all the windows exhibited a slight dimming including the driver window. But when the driver window was engaged in down position I didn't see a slight dimming. So I deduce that the switch is probably good and I should move forward with a new regulator / motor combo replacement, plus the plastic junk for about $50. DIY. Does this sound right? BTW, this regulator was replaced about eight-years ago or so. It had the classic BMW fallen window syndrome.

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X5 3.0 AUTO -2001 - 238,000 miles