C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

Both Dipped Beams Stopped Working

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Old Oct 4, 2025 | 09:48 PM
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2007 C220 CDI OM646
Both Dipped Beams Stopped Working

So earlier today I suddenly got two messages on my gauge-cluster. That there was a fault with both my Right and Left-Dipped beams!
Didn't think much of it until later when I noticed that my total combined light output was very weak. I had to put my lower fog-lights on when driving normally as my country (Norway) requires daytime running lights. And some is better than none for the sake of safety even though its still not perfectly legal to drive like that.

Now I wonder, what could be the common denominator for both lights stopping to work at the same time (both low beams). My high beams and fog-lights work perfectly fine. Is it a fuse (then which one and on which fuse panel) or something else?
I don't know whether the low beams are xenon or not, if so could it be a common ballast problem? I replaced one high-beam ballast earlier this year, as each high-beam has their own. My high-beams are xenon, so I guess the low-ones are to?
But obviously there is a common denominator with my Dipped-Beam problem!

Any help is much appreciated!
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Old Oct 4, 2025 | 11:40 PM
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W204 2010 C300 4matic Sport M272
With your vin you can look up your build sheet and see what options you have for lighting. 614 is for Bi-xenon headlamps. Or just open the covers on the back of the headlight housings and look. there is also a sticker label on each housing, if you look down at the housing next to the hood latches you can probably see it. It will list all the bulbs in the housing.

The fuses in the front sam that deal with the headlamps are fuse 14, 29 and 30 depending on your model. If im checking fuses I will check them all while im in there, simple with a multimeter. Heres a link to the fuse diagrams: https://fuse-box.info/mercedes-benz/...uses-and-relay

You can always test for voltage at the harness where it connects to the headlight housing.

Heres a link to the 2007 W204 manual with diagrams. Not your exact submodel but should be the same or similar. Lighting and Horns > Diagrams: https://charm.li/Mercedes%20Benz/200...orns/Diagrams/







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Old Oct 5, 2025 | 08:17 AM
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2007 C220 CDI OM646
Originally Posted by TimC300
With your vin you can look up your build sheet and see what options you have for lighting. 614 is for Bi-xenon headlamps. Or just open the covers on the back of the headlight housings and look. there is also a sticker label on each housing, if you look down at the housing next to the hood latches you can probably see it. It will list all the bulbs in the housing.

The fuses in the front sam that deal with the headlamps are fuse 14, 29 and 30 depending on your model. If im checking fuses I will check them all while im in there, simple with a multimeter. Heres a link to the fuse diagrams: https://fuse-box.info/mercedes-benz/...uses-and-relay

You can always test for voltage at the harness where it connects to the headlight housing.

Heres a link to the 2007 W204 manual with diagrams. Not your exact submodel but should be the same or similar. Lighting and Horns > Diagrams: https://charm.li/Mercedes%20Benz/200...orns/Diagrams/




Thank you so much. I'll go and check that out. Code 614 does not appear on the build-sheet, so I guess no Bi-Xenon then.
You're amazing!
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Old Oct 5, 2025 | 02:04 PM
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2007 C220 CDI OM646
Originally Posted by TimC300
With your vin you can look up your build sheet and see what options you have for lighting. 614 is for Bi-xenon headlamps. Or just open the covers on the back of the headlight housings and look. there is also a sticker label on each housing, if you look down at the housing next to the hood latches you can probably see it. It will list all the bulbs in the housing.

The fuses in the front sam that deal with the headlamps are fuse 14, 29 and 30 depending on your model. If im checking fuses I will check them all while im in there, simple with a multimeter. Heres a link to the fuse diagrams: https://fuse-box.info/mercedes-benz/...uses-and-relay

You can always test for voltage at the harness where it connects to the headlight housing.

Heres a link to the 2007 W204 manual with diagrams. Not your exact submodel but should be the same or similar. Lighting and Horns > Diagrams: https://charm.li/Mercedes%20Benz/200...orns/Diagrams/




I tested all the fuses with a multimeter and all were working fine. So that is not the problem. After looking at the bulbs I've seen that they're both Xenon (Both Low-Beams (Dipped) and the High-Beams).
Should I just take it into the shop for a diagnosis?
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Old Oct 5, 2025 | 08:08 PM
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W204 2010 C300 4matic Sport M272
you have a 2007?

So it is a W203, 0r W204? Just want to confirm what we are dealing with.
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Old Oct 5, 2025 | 08:09 PM
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2007 C220 CDI OM646
It's a W204
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Old Oct 5, 2025 | 08:12 PM
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W204 2010 C300 4matic Sport M272
What is the vin?
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