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Discussion Starter · #1 · (Edited)
Getting an issue where my driver side low beam is turning off randomly. When that happens, the warning indication comes out stating a low beam malfunction. The weird part is, when that happens, all I do is turn the high beam on and off and the low beam will magically work again. But did I mention that it randomly turns off? Yes. Anyone got/had the same issue? Thanks.
 

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Michael
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Before spending money check the connections are not loose to the light cluster or any high resistance corrosion!!
 

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Michael
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Mostly done by sight by checking the colour of the connectors or earthing points for corrosion, generally white in nature. Just be careful as you do it, often you can see the points where water has got into the connectors. As I said this is a quick method before you start spending money look for simple things first !!!!
 

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Discussion Starter · #5 ·
Okay, thanks! But just to verify, the connectors you’re talking about are the one that connect to the back of the headlights unit correct? And if so are there an easy way to check back there without having to remove the whole front bumper?
 

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Discussion Starter · #6 ·
Update: I took it to a specialist and they told me it might be the LED control module, but they’re not 100% sure. I wasn’t about to drop $600-700 + labor, but It has gotten a lot worst now. Every time the wheel is turned to the left, the left low beam would turn off, and the warning indicator would come on. The weird thing is, if I turn the light switch from the auto light position to the manual on position, it works fine. This makes me think that it might have something to do with the adaptive light function.
 

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Michael
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Do you have the fully adaptive headlight option, if so, look at the bank of Leds below the headlight cluster as these are used to flick the light from side of the road through to dipping automatically with approaching traffic, they also are used when turning left and right.
I am not sure but you may gain access via the wheel well panel for the lower lights????? there is a link to the repairs process for our cars Technical instructions manual, you may find some answers!!!

When you switch on the adaptive function does it work correctly ie can you get the lights to work in all modes??
 

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Discussion Starter · #8 ·
The left headlight is completely dead now. =[ only the halos and other small led lights works. Just hoping I won’t have to replace the whole headlight unit. Thanks for the advise. I’ll keep updating.
 

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Michael
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It dipped beam or full beam not working?? What some do if your have the knowledge is to swap over left to right or visa versa the headlight ballasts to prove if headlight or ballast at fault>
 

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I currently have the same issue with my 640i GC (with adaptive LED).
Would receive left dipped beam failure message and headlight would shut off.
Problem does not persist if I have my light switch on manual mode it seems.

Dealer could not find anything, despite paying diagnostic labor.
 

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Discussion Starter · #11 ·
Same here. It only happens when the light switch is on auto, and turning the wheel to the left. One my bmw specialist said it might be the headlight control module.
 

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Same here. It only happens when the light switch is on auto, and turning the wheel to the left. One my bmw specialist said it might be the headlight control module.
It "should" be the left headlight unit itself or the LED cornering light module on the left, since every other part is shared with the right side,
if it's a part defect. Question is how do we test it?
 

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Discussion Starter · #14 ·
Update on my headlight: It turns out that my whole headlight is no good. Something with the LED perhaps? My specialist tried swapping out the all of the older modules from the defected headlight and replacing them with the newer modules, but unfortunately the result came out the same. Usually LED are supposed to last for a long time. Maybe mine was just faulty. I just bought a new headlight (with no modules) and will be getting it install soon. I will update on the result soon.
 

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Went to dealer today, they diagnosed "possibly" the left LED module as the culprit.
They asked me to bring the car in again for another check, where they take out the headlight and measure the module and the cables to it as a further step.
Not sure..
 

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Discussion Starter · #16 ·
Got my headlight fixed. It’s the LEDs in the headlight that is causing the malfunction. Ended up buying just the headlight and using the old modules since they were still good.
 

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Are the LEDs inside the headlight replacable?
You have an idea which LED inside the headlight it was? Or was it rather a cable/connection issue?

So you purchased a new (used) headlight and installed it, keeping your existing modules?
 

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Discussion Starter · #18 ·
I was told that the main LEDs low/high we're not replaceable. Just looking at it from the inside and out are a bit confusing to even dismantle. With that being said, I couldn't really pinpoint to the exact problem. So I just bought a used headlight on eBay and use the my existing modules from the bad headlight and installed in the new (used) headlight. Everything works fine now!
Are the LEDs inside the headlight replacable?
You have an idea which LED inside the headlight it was? Or was it rather a cable/connection issue?

So you purchased a new (used) headlight and installed it, keeping your existing modules?
 

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Discussion Starter · #20 ·
I know how you feel. The last thing I wanted to do was to buy a headlight. But the price of a new headlight itself isn't as bad. You can probably find one for $400 used. That's the same price as buying one of the module. Crazy right? Just make sure the headlight work and all of the taps are intact with a 30 days return, just in case it didn't work for you. If it's not the headlight, then you know it's something else. Process of elemination. That how they figured out what was wrong with mine. Good luck!
Then I fear a headlight replace is the fate that awaits me.
An used unit might occur the same problem.
 
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