my driver side headlight is not working,

Hello, There may be one of two things happening: bad connections or bad relays. Check to see where the last point the two headlights share power is. It is likely at the relay, but if they have their own relays, you can swap those to see if the problem moves to the other. Next, if the relays are good/if there is only one relay, test for voltage at the connector, and compare it with the working side. If you are missing voltage, move up the wire until you find what is stopping the current. Not the A1 method, but pretty straight-forward for home testing. Let me know any questions you have, and here is a link if you would like shop recommendations: http://repairpal.com/bmw-within-10-miles-of-little-rock-arkansas-72204