Headlight adjustment - Page 3 - Mercedes-Benz Forum
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post #21 of 35 (permalink) Old 11-21-2014, 07:10 PM
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I'm not positive, but I think it is used for those cars that have self-leveling headlights. Inside the headlight, the mechanism is connected to the vertical adjuster for the Low beams. I think it is only used when HID / BiXenon headlights are fitted to the car. I think some kind of servo motor replaces the white cover.
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post #22 of 35 (permalink) Old 11-22-2014, 04:50 PM
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Originally Posted by Werkstattmeister View Post
I'm not positive, but I think it is used for those cars that have self-leveling headlights. Inside the headlight, the mechanism is connected to the vertical adjuster for the Low beams. I think it is only used when HID / BiXenon headlights are fitted to the car. I think some kind of servo motor replaces the white cover.

The hid lamps cannot be manually adjusted ?
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post #23 of 35 (permalink) Old 12-26-2014, 05:48 AM
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I finally had a chance to attempt removal of the cover over the single adjustment screw. It is not possible to lift it over that screw without removing the headlight assembly from the car. If anyone knows how, please advise. Thanks.
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post #24 of 35 (permalink) Old 12-27-2014, 05:51 AM
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Maybe a little bit off-topic, but on start-up, when the xenon lights do their spiel with moving first down and then up again, do they actually adjust themselves based on the level of the car? That is, if the car is loaded (i.e. lots of heavy stuff in the trunk), do they compensate for it? This weekend I had the chance to drive a lot with the high beams on, and they seemed to point rather high. They didn't seem to go for distance, rather than height. The car was fully loaded, and I thought that they were shining way too high. As were the low beams, by the way, and a few cars actually flashed their lights at me, thinking I had my high beams on when I in fact had not. I've driven cars that had manual adjustments for the lights, but I thought the W211 xenons do that automatically. And if they do, is it done only on start-up or continuously; i.e. if the car is running and you load up the trunk, do the lights compensate for it?

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post #25 of 35 (permalink) Old 02-03-2018, 06:28 PM
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I finally had a chance to attempt removal of the cover over the single adjustment screw. It is not possible to lift it over that screw without removing the headlight assembly from the car. If anyone knows how, please advise. Thanks.
It IS possible, I just figured out how the other night! Finally after almost four years of W211 ownership, I was able lower the high beams to where they should be! Why the factory had the high beams on US cars aimed so much higher then the low beams, I have no idea!

If you take a dremel with a drill bit attachment and make several holes in the top of the plastic cover around the perimeter of the high beam adjustment screw, you can then break off that section of the bridge piece by piece with a set of needle nose pliers, remove the three T-20? torx screws securing it and then lift the other side of the bridge up over the low beam adjustment screw and it pulls right out!
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post #26 of 35 (permalink) Old 02-04-2018, 05:42 AM
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Not sure why you had to cut up that high beam headlight height adjustment assembly. Was yours not adjusting the high beam because the gears in the assembly were stripped out? Did it not provide enough travel to get the beam pattern where you wanted?

Normally you just use a socket on the large plastic nut from above without having to damage the high beam headlight height adjustment assembly. Just want to clarify that folks don't go cutting things up if they don't need to.
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post #27 of 35 (permalink) Old 02-04-2018, 06:08 AM
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I believe that he wanted to adjust the hi-beams independent of the low beams.

John
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post #28 of 35 (permalink) Old 02-04-2018, 06:57 AM
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Okay, thanks for the clarification.

I didn't know that the high beam and low beam adjusted together on the non-active, non-Bi Zenon headlamps. That adjustment nut affects just the high beam on the Active Bi-Zenon headlamps. Low beam height is set via Star on those unless you want to shim the whole headlight assembly.
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post #29 of 35 (permalink) Old 02-04-2018, 07:08 AM
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Originally Posted by Sleeper Benz View Post
Not sure why you had to cut up that high beam headlight height adjustment assembly. Was yours not adjusting the high beam because the gears in the assembly were stripped out? Did it not provide enough travel to get the beam pattern where you wanted?

Normally you just use a socket on the large plastic nut from above without having to damage the high beam headlight height adjustment assembly. Just want to clarify that folks don't go cutting things up if they don't need to.

The problem is that the aim of the high beams is so off (for US 211 owners with the standard halogen headlamps), that when trying to properly adjust the headlamps either the low beams will be too low or the high beams will be be too high.

Had the low/high beams been more closely aligned at the factory, the bridge connecting them would not have been a problem. There is no way to adjust the high beams independently from the low beams until it's removed. I was careful to not damage the headlight assembly or adjustment screws in the process of removing it.

As shown in Craftysince86's earlier post, European cars do not have the bridge installed.
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post #30 of 35 (permalink) Old 02-10-2018, 07:33 AM
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Makes sense. Good photos, thanks.
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