Rom1969

Hello, need help on daytime running light fault DRL on MB W205 car C180 2014 yr.
The RHS DRL stopped working. Thought it was the DRL led module.
I swapped it with the LHS and it worked on the left. So the issue is not the DRL module.
I checked all voltages on connectors on both sides and they all give the same values.
The dashboard indicates either daytime running light DRL or parking light fault as it uses the same led tube.
Thank you to advise on possible causes.

Rom1969

Hello I eventually figured out that the problem was with a defective led headlight module (circuit board enclosed in a heatsink casing) for the right hand side headlight. In fact the day running light/parking light (led eye) connects to this module.
After changing this module, the led light was restored. Also, you need to remove the front bumper to access this module.
I had to do it at the MB concessionaire.
Hope this can assist those with similar issues.

chrisdean

Which module turned out to be faulty, the small one with the tiny led's connecting to the light tube or the large rectangular unit underneath?

Rom1969

It was the rectangular unit underneath see photos of defective module below

chrisdean

Thanks, very usefull

darwin329

hey buddy i have w205 2015 model. My headlight day light is not working during the day i wonder if its normal? It only turns ON when its getting darker... is that normal for 2015 w205

Akbar Sarwar

Hi was this a straight swap for the new module or did you have to programe the new module? I have the exact same issue which just came about this week. Thanks

billc63amg

Bump

Also want to know did you have to change the module and program it from Merc?

Elvisfan0108

if you have turned the headlight switch on and the headlights don’t work, but they work on auto, the switch may be bad.

KiwiPete

Hi
I have the same problem as the original post with dashboard error saying 'Left Daytime Driving Lamp' and 'Front Left Parking Lamp' warning messages

I get two error messages from a home diagnostics tools.

1. The output for the standing light has a malfunction. There is a short to ground.
2. Communication with the control module 'Multifunction Camera' has a malfunction.

I also swapped the LED lighting units between LHS and RHS, the LHS unit worked fine when plugged into the RHS. The RHS unit did not work when plugged into the LHS, suggesting the LED units are fine.
So thoughts are now turning to the headlight module as per your experience.

Before I replace this unit though, did you run any diagnostics codes when you had the error?
Just wondering if my 'Short To Ground' error code would occur if 'led headlight module (circuit board enclosed in a heatsink casing) was also at fault in this case?

Thanks in advance.

Pete