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Click on the link. What testing have you done. Did you check for voltage and ground at the lo beams? Use a test light. In the diagram, the top wire for low beams is voltage, the bottom wire is ground. There are lo beam fuses, check those. Check voltage at fuse with lo beams turned on. It might be possible to unplug the low beam relay and use proper jumper wire on proper terminals to see if lo beams will operate. If they operate with the jumper but not w/o, check the control side of relay.
Your head lamp switch and dimmer are both inputs to bcm. I can only help with testing. You have to do the testing.
SOURCE: 2005 buick lacrosse, Headlights not working.
it seem that all your vehicle have electrical problems. is better to make a electric inpection to the dealer.
SOURCE: the low-beam headlights in my 2005 LaCrosse won't
2 possibilitys.both hi beam elements are blown,unlikely. Or your switch is bad works on low beam but not hi beam id say switch needs replacing.
SOURCE: how do i change the low-beam bulb on my 2005 buick
there should be 2 brackets at the rear of bulb housing, 1 may have a small bolt.....lift these up and the headlamp housing should come out. you will see how it works when you get it apart.
SOURCE: 2006 buick lacrosse how to replace headlight low
The bright light fitting is the same as the dim so take it apart fist to see how the cover screws off/on and the light comes out. Both the cover and the bulb are removed by a standard twist to the counterclockwise and replaced by a twist to the clockwise. Now to the dim light. You have to release the entire light assembly before you can remove the screw-on cover to reach the light. On the rear edge of the light unit closest to the engine is a white locking tab. Pull that tab up just to the point where it releases…pull too far and it locks again. Next, locate the other locking bracket which is a metal bracket in the center-rear of the light assembly. This bracket is held down by a screw. Remove the screw with a 10mm wrench. Lift the bracket just like you did the white bracket. You should now be able to pull (or pry) the entire light unit forward a little. Depending on the size of your hands this might be enough. If not, then you need to release the plastic bumper assembly to give you a little more space. This is done by removing two expansion locking pins, one that holds the little plastic strip down between the bright and dim lights and one that is located inside a rubber bumper on the engine side of the light unit. To remove these locking pins, pull or pry up the little tab in the center of the pin just like you were pulling a nail by the head. That should give you a little more space.
SOURCE: 2007 Buick Lacrosse low beam headlights both went
The relay under the hood may have gone out. We had the same problem on our 2007 Buick LaCrosse CX. The bulbs were fine, high beams worked, all turn signals and everything except the low beams turned on. Turns out the relay had gone bad.
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