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C300 2017 headlight led

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Old Jan 26, 2023 | 05:51 PM
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Mercedes c300 2017
C300 2017 headlight led

C300 2017 amg package, on the daylight led there is one headlight led brighter than the other side, I wonder why and what are my options except changing the whole headlight..? Thank you.
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Old Jan 26, 2023 | 06:07 PM
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Originally Posted by Jake321
C300 2017 amg package, on the daylight led there is one headlight led brighter than the other side, I wonder why and what are my options except changing the whole headlight..? Thank you.
Sounds like the dimmer, it usually dims when you signal for example apparently it is thinking that you are signaling hence it dimmed it down.
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Old Jan 26, 2023 | 07:15 PM
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Can it be fixed by unplugging the battery and putting it back?
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Old Jan 26, 2023 | 07:29 PM
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Originally Posted by Jake321
Can it be fixed by unplugging the battery and putting it back?
I believe this is the part number, not 100% sure though: A2059005010
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Old Jan 28, 2023 | 01:54 PM
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So as I understand it,

Last edited by Jake321; Jan 28, 2023 at 02:27 PM.
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Old Jan 28, 2023 | 02:22 PM
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So as I understand it, this would be the ballast module for the headlight, but what I mean is the drI still dimmes when I signal on that side, it's more like an overall intensity level less brighter than the other side.. by changing it, it would increase the power of

the drI? I hope that someone already had the problem solved? thank you much appreciated🙏🏻
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Old Jan 28, 2023 | 05:36 PM
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Originally Posted by Jake321
So as I understand it, this would be the ballast module for the headlight, but what I mean is the drI still dimmes when I signal on that side, it's more like an overall intensity level less brighter than the other side.. by changing it, it would increase the power of

the drI? I hope that someone already had the problem solved? thank you much appreciated🙏🏻
The module controls that behaviour, however I can't guarantee it will fix it, as I mentioned it could also be the dimmer that is malfunctioning but what you described is similar to what I heard in the past and this is what was the fix, I can't guarantee anything though.
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Old Jan 30, 2023 | 04:22 PM
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Alright the part is ordered, I’ll let you know thanks again!
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Old Jan 30, 2023 | 10:13 PM
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Originally Posted by Jake321
Alright the part is ordered, I’ll let you know thanks again!
You are very welcome, glad to help, hopefully it does solve your issue that you are facing.
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Old Feb 15, 2023 | 10:11 AM
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OP, just want to follow up with you, did it fixed your issue?
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Old Feb 15, 2023 | 11:26 AM
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Hello, I received the piece this week, hopefully by the end of next week I will be able to tell you, thanks again!
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Old Feb 15, 2023 | 11:29 AM
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Originally Posted by Jake321
Hello, I received the piece this week, hopefully by the end of next week I will be able to tell you, thanks again!
You're very welcome, hopefully it fixes it for you.
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Old Feb 28, 2023 | 07:01 PM
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Hello, I did change the piece today and it didn’t fix it, maybe I should try changing the dimer? Or probably it’s just the whole headlight the problem.. thanks!
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Old Feb 28, 2023 | 07:41 PM
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Originally Posted by Jake321
Hello, I did change the piece today and it didn’t fix it, maybe I should try changing the dimer? Or probably it’s just the whole headlight the problem.. thanks!
Forgot if you can use it on each side or not, if so did you try testing it that way with the known good side?
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Old Feb 28, 2023 | 09:49 PM
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Infact, I assumed that it was the lowest one the weakest.. what you mean is to try to change the other side maybe it is overpowered ?
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Old Mar 1, 2023 | 06:19 AM
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If you meant one side DRL was dimmer than the other side, you replaced a wrong part. There are two control modules on the headlight. The smaller one at upper side is the LED module for the DRL. Part number maybe 205-906-06-01. As it’s interchangeable, switch left and right before ordering a new one.

If it’s still dimmer after switching left-right, it’s because of the parameters in the headlight control module (the controller on the bottom of the headlight that you just replaced). To check the parameter, you need a software & hardware for coding.
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Old Mar 1, 2023 | 09:31 AM
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Originally Posted by realeric
If you meant one side DRL was dimmer than the other side, you replaced a wrong part. There are two control modules on the headlight. The smaller one at upper side is the LED module for the DRL. Part number maybe 205-906-06-01. As it’s interchangeable, switch left and right before ordering a new one.

If it’s still dimmer after switching left-right, it’s because of the parameters in the headlight control module (the controller on the bottom of the headlight that you just replaced). To check the parameter, you need a software & hardware for coding.
Thanks for chiming in, sorry about that OP if the part I suggested earlier is incorrect I guess it was a different issue than what my research entails hence why became the wrong part. I am sorry about that.
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Old Mar 1, 2023 | 10:05 AM
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Thumbs up

Originally Posted by W205C43PFL
Thanks for chiming in, sorry about that OP if the part I suggested earlier is incorrect I guess it was a different issue than what my research entails hence why became the wrong part. I am sorry about that.
As there was a possibility that the control module could be the cockpit, your advice could be correct. The control module is a brain, and the LED module is only a muscle worker. If the brain went crazy, the worker would not work correctly. Haha~~~
.
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Old Mar 1, 2023 | 10:11 AM
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Originally Posted by realeric
As there was a possibility that the control module could be the cockpit, your advice could be correct. The control module is a brain, and the LED module is only a muscle worker. If the brain went crazy, the worker would not work correctly. Haha~~~
.
I like the analogy and I really much do appreciate you chiming in and helping OP. It turns out I wasn't able to help OP but at least you were to so thank you for that! not to mention your advice would most likely help others that stumble upon this thread so thanks for commenting!

Last edited by W205C43PFL; Apr 4, 2023 at 11:03 PM.
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Old Mar 1, 2023 | 02:09 PM
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Thank you very much both of you, no worries I will keep the extra piece incase it fails, I already purchased the other one (205-906-06-01) arriving sunday, so by next week I will give u feedback!🙏🏻
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Old Mar 17, 2023 | 12:48 PM
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Back again, I changed the drl module on the headlight that seemed lighter from the other one without trying to switch both of em. I am starting to think thats it’s the brighter one that may be too bright… I will be changing the module for that one too to be sure. After that you said there is some type of coding that can be done..? I will want more information on this procedure, thank you once again, have a nice friday,

Jake
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Old Mar 18, 2023 | 12:12 AM
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Originally Posted by Jake321
Back again, I changed the drl module on the headlight that seemed lighter from the other one without trying to switch both of em. I am starting to think thats it’s the brighter one that may be too bright… I will be changing the module for that one too to be sure. After that you said there is some type of coding that can be done..? I will want more information on this procedure, thank you once again, have a nice friday,

Jake
Sorry to hear that it didn't solve your issue, by coding, forum member realeric mentioned "to check parameters". I believe Xentry Diagnostics MB Star will be able to show that information.
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Old Mar 18, 2023 | 01:23 PM
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Originally Posted by Jake321
Back again, I changed the drl module on the headlight that seemed lighter from the other one without trying to switch both of em. I am starting to think thats it’s the brighter one that may be too bright… I will be changing the module for that one too to be sure. After that you said there is some type of coding that can be done..? I will want more information on this procedure, thank you once again, have a nice friday,
Originally Posted by W205C43PFL
Sorry to hear that it didn't solve your issue, by coding, forum member realeric mentioned "to check parameters". I believe Xentry Diagnostics MB Star will be able to show that information.
While it's possible to adjust the brightness of headlights in the HLI_FR222 or HLI_FL222 using parameters (i.e., coding), this doesn't need to be typically done by regular vehicle owners. I've created a document on retrofitting headlights and started a thread on the topic, but I haven't had a chance to finish the thread yet~. If you replaced the control module (the wrong part you've purchased) and didn't copy the parameters from the old unit to the new unit (we call it adaptation), the new control module will default to 100% brightness. US vehicles typically set the LED to a lower brightness level.

The parameters for brightness are saved in the control module, rather than the DRL modules themselves, which are simply mechanical parts. However, even with the same parameters in the control modules, the brightness of the LED on DRL modules can vary depending on their age or manufacturer, especially if they are not OEM.
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Old Mar 18, 2023 | 05:39 PM
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Alright and the fact I live in Canada doesn’t change any menus? I mean in all the settings I will still be able to adjust the brightness? Thanks,
I absolutely have no knowledge in that kind of stuff.
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Old Mar 18, 2023 | 07:59 PM
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Originally Posted by realeric
While it's possible to adjust the brightness of headlights in the HLI_FR222 or HLI_FL222 using parameters (i.e., coding), this doesn't need to be typically done by regular vehicle owners. I've created a document on retrofitting headlights and started a thread on the topic, but I haven't had a chance to finish the thread yet~. If you replaced the control module (the wrong part you've purchased) and didn't copy the parameters from the old unit to the new unit (we call it adaptation), the new control module will default to 100% brightness. US vehicles typically set the LED to a lower brightness level.

The parameters for brightness are saved in the control module, rather than the DRL modules themselves, which are simply mechanical parts. However, even with the same parameters in the control modules, the brightness of the LED on DRL modules can vary depending on their age or manufacturer, especially if they are not OEM.
Thanks for the detailed explanation.
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