W205 used headlight coding

[shaizer12]

Hi guys,

Apologies if this has already been asked on the forum. I recently had my near-side headlight damaged in an accident and decided to get it fixed myself at a local body shop - I managed to find a replacement headlight which had the same code as the one recommended by the Mercedes dealership for my car - W205 C220d 2016 with adaptive headlights - part number A2059068102. The replacement was used but in good condition with only 2 scratches and no cracks with all modules included. I did suspect that it will require coding for the full adaptive/LED functioning to return and this was sadly the case as only the full/dipped beam is working and the bodyshop guy advised that it needs to be coded.

I saw a few youtube videos in which they recode a headlight however they all scan a QR code on the headlight which is missing on mine - who would remove this?! Can anyone help if they have the same headlight part number and a sticker which looks like this:


I am taking it to my local Mercedes specialist and I'm not sure he will be able to help if this sticker is not there.

Thanks in advance

 

[OneForTheRoad]

When I had my e350 hooked upto star , it scanned the whole car , any abnormalities were picked up and the appropriate data was written to the ECU.

 

[Uky]

The LED-code label indicates the color/luminocity vs current of the LED's since they differ between batches. When first installed into a car, the head light should not turn on since it has not got the parameters set by the Xentry. When initializing, The Xentry system scans the head lights since a factory new head light needs to be software adjusted so that the currents are set to fully match the other (not replaced) head light assembly. This takes some time to complete during which all other consumers has to be turned off and during which the car is connected to an external 12V source.

There is at least one YT-film describing this procedure on the internet.

One typical mistake made is when the careful car owner decides to use a high pressure washer that blows the LED-code labels away. So for safety/backup purposes, I advice any owner of a Mercedes where such labels are present to take a high resolution picture of both side LED-codes and store these pictures in a safe place.

And IMHO: An advice to Mercedes - use some other less stupid method for LED-Code markings.

 

[ReggieCyde]

Reading this with interest, I wonder how the plug n play control modules work? They claim to not need coding so how are the matching to the other headlight (assuming only one has been replaced)?

 

[OneForTheRoad]

Reading this with interest, I wonder how the plug n play control modules work? They claim to not need coding so how are the matching to the other headlight (assuming only one has been replaced)?

It's more to do with setting the motors that control heights and aim , afaik , especially with intelligent led headlights.

 

[ReggieCyde]

It's more to do with setting the motors that control heights and aim , afaik , especially with intelligent led headlights.

I imagine that's true though I've also read that it's to do with the current being fed to the LEDs and ensuring they match so at the very least you get the same shade and also to avoid blowing the LEDs. My guess is if in the event you need to replace the entire headlight unit, if you replace it with the exact part number, manufacturer etc and use a plug and play module that is also the exact part number match then it shouldn't require coding in any case as all the parameters will align by default.

 

[shaizer12]

Just as an update - took it to a coding specialist and he said it was blown fuse ! After replacing the fuse it was all working and he reset all the error messages and no more came up.

Honestly felt so embarrassed for overlooking a fuse problem before considering a coding issue - I presumed it was this as I had ordered a new headlight (and modules that came with it) with a different batch number and superceded product code (as recommended by Merc).

In hindsight, blown fuse would make sense as the error messages and functional issues came on immediately after the crash which may have caused a power surge - the old cracked headlight worked the same as the newly installed headlight in terms of normal dipped/high beam but no indicator, daylight led and intelligent assist.

He advised that no coding is required and has been driving fine so far, haven't yet tested adaptive high beam which I would need to venture into the countryside for.