Intermittent issue of the left headlight not working?

2014 MERCEDES BENZ E350

120,000 MILES • 3.5L • 6 CYL • 2WD • AUTOMATIC

GUGA TODUA

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4 POSTS
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I have Full-LED headlights.
Sometimes, the left headlight doesn't work. Only LED and turn signals are lighting up.

I've had a different problem with this headlight, control module had some issues and I had it replaced, reprogrammed. Though that this dipped beam was related to a control module.

Can this be a cable-related problem or is it something bigger?
Should I consult an electrician or someone else?

Mar 4, 2024 at 2:28 PM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

Hi,

I just went to the wiring schematics to determine what could be the issue. I found several options to pick from. Could you take a look at the pic below and let me know which fits your vehicle? The schematics are different.

Let me know. Also, let me know if you have checked the bulb and if there is power to the bulb.

Take care,

Joe

Image (Click to enlarge)

Mar 4, 2024 at 7:27 PM

GUGA TODUA

MEMBER
4 POSTS

My car is a Coupe. I don't know whether it is static or dynamic.
Looks static because LEDs are always on.

Mar 5, 2024 at 12:17 AM

GUGA TODUA

MEMBER
4 POSTS

As for the bulb, I have not checked it. Don't know how to check it.

Mar 5, 2024 at 2:40 AM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

Hi,

What I need you to do is this. At the headlamp assembly, there will be a white wire with a black tracer. I need you to locate that wire.

Turn the high beam on and use a test light or voltmeter, see if there is power present. If it has power, locate the brown wire, and check it for continuity to ground. If you have power and ground, the light itself is the likely problem.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Try this and let me know what you find.

Take care,

Joe

See pic below.

Image (Click to enlarge)

Mar 5, 2024 at 7:31 PM