The window regulators in e46s are notorious for failure.
Often, you can fix them with zip ties. Failing that, replacing the regulator is not too hard.
Disconnect the battery before starting to remove the door panel because there is an air bag in the door panel.
Pry up the trim strip starting from the rear. Remove all the screws that hold on the door panel. One of them is hiding beneath the mirror control button. Pry the switch up out of the door to find the screw.
DO NOT connect the battery and turn on the key while the air bag is unplugged.
Once you can see the regulator, you may be able to see where the cable has broken loose from the regulator. You may be able to zip tie it back in place. I did that several years ago on my wife's '04 330 and it is still working.
You can get a window regulator for this car on Amazon.com for $50 or you can get a BMW regulator for $150. Since we know that the BMW part is crappy, the $50 aftermarket part from Amazon might be worth a try.
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