What are all the ways to get a headlight working?

Napa carries the headlight pigtail and connectors for BMW, So it must be a common part that fails http://partimages.genpt.com/largeimages/100089.jpg But there are 4 different styles So best to drive to your local Napa store So the counter person can match it directly and you can find a store near you here www.napaonline.com

did you check the lighting control module???