OK.
Just went out to try. Opened the trunk and started the car. The noise
(Hum) is now also gone. Guess what no longer works. The sun roof will
not open. I can hear it trying (there is the normal sort of whirr sound) but
the sun roof does not move in either direction. It is not used often but I did have it open briefly the day before maybe.
I will do more research but am sure I will be back with more questions.
Thanks especially to Johnt49 and Toomany MBZ for pointing the compass.
Bill
one more thing. Since it sounds like it is trying to open, do I assume it is a broken sun roof cable rather than the sun roof relay or sun roof motor?
Thanks again.