Bulb, igniter, or module, in order of likelihood and cost. My bulb was out, so had a bulb put in, but still out. Had an off-duty BMW tech do it. HOWEVER, if you have the HID Xenon headlight option, you can get shocked to death (yes, death) if you touch the wrong things together.
It's in the owner's manual -- turn wheels in or out, on front inside of wheel well is a cover that has small screws holding it in. The there's a plastic cove that snaps off and, walla, you're at the back of the light. It just twists in and out.
Don't touch the new bulb (particularly if it's a Xenon).
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If the lights are switched then the switch controls a rely all lights are switched on bmw. Can use fog lights temporarily. Find rely test with continuity meter when on, disconnect lights first, then turn on lights switch, check for 12v at light bulb terms, if 12v then bulbs bad, if not relay is bad, test with continuity meter, rely should read 0 ohms when lights switched on, infinite open circuit when switched off. If lights work in manual switch pos then solar sensor bad.
replacing the headlight unit will not solve your problem since your problem is about electricity.
try to search for a relay or fuse for your headlight, most likely you will see a relay since there is only a single fuse for both headlights. meaning of this fuse blows off, both headlights will not turn on. relays are attached to each headlight, so if one goes off, the other one will still work.
if this does not solve your problem, have an electrician check your headlight wiring connections.
there area magnitude of things that can be the issue here. I wil take a chance here and say that there is an issue with a couple of sensors. This situation involves 1. The brake light sensor (which indicates that i brake light bulb is faulty) 2. The Tire pressure sensor (which is the tire pressure) and 3. ABS sensor ( Which i would associate it with a wheel speed sensor)
You should check the tire pressure, and correct it. Check the bulbs on your brake light and replace as necessary. Then check for a torn or broken ABS sensor, which are located on each wheel,
You will need to open up hood, reach inside by headlight, FInd the plastic ring and turn counter-clockwise and then remove it. Then take bulb and harness and turn and pull that out. Unclip the harness from bulb.
The adjustment screws/nuts should be located either on the top of the headlamp assembly,
behind the headlamp assembly, or near the frame rail by the radiator
You will have vertical adjustment screws for each independent beam
(separate highs and separate lows, but will be same screw if highs and
lows are the same bulb). You may also have additional horizontal
adjustment screws as well
your car on a level ground 30 feet from a wall and measure the height
from the ground to the bulb and mark on a wall (do this for highs beams
and low beams if the bulbs are separate, if highs and lows are the same
bulb, only do it for the lows)
If the headlights read VOR, then
aim the brightest part or cutoff part just below the mark on the wall.
If it says VOL or nothing, aim them 2 inches below the mark on the wall.
depends on if it is xenon or not if it is a xenon it is a good chance you are looking more than just a bulb possibly an ignigtor or a module or all three, if it is just a regular bulb then take the conector loose on the back of the bulb and then twist the bulb either left or rightit iwll come out if it has a holding ring then that is what you twist instead, KEY point make sure you have everything lined up like the tabs or it will fight you going back in
I am assuming that you have a burned out head light bulb. 1) Open hood. 2) Working in back of headlight assembly, grasp rear of bulb socket (harness connector) and turn counterclockwise 90 degrees. Pull bulb out of headlight assembly. 3) Disconnect harness connector from bulb (gently pry, it's plastic) 4) Installation is reverse of removal. (Do not touch halogen bulb with bare skin-oils from hand will cause bulb to burn out.) Align tabs on bulb base to cutouts on rear of lens assembly. (Note bottom tab is wider than other two) Secure bulb by rotating clockwise 90 degrees. Low beam bulb H9006 High beam bulb H9005