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Adaptive multi beam LED headlights problem

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Digsy, Nov 4, 2019.

  1. Digsy

    Digsy Active Member

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    Your Mercedes:
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    I seem to be having a recurring issue with the adaptive headlights on my new C class.

    When I set off home from work in the evening, the adaptive main beam works fine. Then after a few miles, I get the "adaptive headlights camera obscured" warning (I cannot remember the exact wording). Then after ten minutes or so more it rectifies itself.

    I checked the cameras today and I am pretty sure that the camera housing is misting up on the inside. I think this is happening when I get into the car and switch on the heating. After a short drive the air inside the camera housing gets warm enough to condense against the windscreen (which is still relatively cold). After a few more miles, the windscreen itself has warmed up sufficiently that the misting clears itself.

    It didn't do this when the weather was warmer, which I think also lends weight to this theory. But it seems like a pretty basic and avoidable issue.

    Anyone else noticed a similar problem?
     
  2. Botus

    Botus Senior Member

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    never turn off the AC, (it is as much a safety device demisting the windows, as it is a cooling device in the summer)
    always set heater so there's airflow to the screen
    don't forget to keep the screen clean on the outside and have good wiper blades


    people who love to turn off the AC... allow humidity levels to build in the car until it will take a few long drives to get back to standard and misting risk is reduced to acceptable levels the car's systems were designed to cope with
     
    Last edited: Nov 4, 2019
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  3. ajlsl600

    ajlsl600 Senior Member

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    leaving a/c on lowers yr mpg ,no ? wouldnt, a simple heater devise built into this headache camera have been a bettter idea, bit like aircraft pitot similar to

    https://www.mcfarlaneaviation.com/products/category/pitot-heater-elements/

    load on alternator minimal.
    myself i use the old fashioned ,read ,reliable,cheap, adaptive headlight method . called the flicking dipswitch method ! doing pretty well for 40 yr now
     
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  4. rf065

    rf065 Senior Member

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    I've never noticed any real reduction in MPG when using AC, so it must be minimal these days.
    As for heaters for the cameras, both of mine have them as standard so Mercedes have already thought of this.
     
  5. Srdl

    Srdl Senior Member

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    No - might make a difference if you have a small engined, low powered petrol car but you won’t notice any extra consumption in any car with a decent sized motor.
     
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  6. rorywquin

    rorywquin Senior Member

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    Don't knock it till you've tried it:)......in the early days pilots said glass cockpits would never be safe......ILS is brilliant (excuse the pun) ........
     
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  7. rf065

    rf065 Senior Member

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    Not really adaptive though is it, only on or off?
    Unlike ILS that will light up every bit of road in front of you except for the rear of the car in front or cars travelling towards you. Now that is adaptive and quite entertaining to watch the beams as they move around at night. I've travelled from Cornwall to Scotland through the night with ILS on full beam the whole way and did not get flashed by anyone even once.
     
  8. EmilysDad

    EmilysDad Senior Member

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    I don't get why you need to be going faster than 30?mph for it to operate. Sometimes on narrow country lanes main beam would be nice when 30? would be way way too fast.
     
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  9. rf065

    rf065 Senior Member

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    Built up areas are usually 30mph and it's illegal to use full beam on these roads.
     
  10. malcolm210

    malcolm210 Senior Member

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    I think your assumption about condensation on the windscreen causing the problem is correct my night vision camera suffered in the same way, poor design really too many items tacked on the inside of the windscreen and not properly sealed or ventilated
     
  11. EmilysDad

    EmilysDad Senior Member

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    but not all roads are built up ;)
     
  12. rorywquin

    rorywquin Senior Member

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    Mine work on country roads under 30 but dip as soon as I get to a village. They are linked to the GPS and know when you are coming upto villages, roundabouts etc.
     
  13. EmilysDad

    EmilysDad Senior Member

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    mine aren't that fancy .... they're intelligent but only xenon/HID :)
     
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  14. ajlsl600

    ajlsl600 Senior Member

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    i have got as sophisticated as nightbreaker bulbs and thats it i am of age where i think most of this stuff as discussed on this thread is just going to cause me grief and expense that i can do without further down the road. so i am sticking with whats simple ,i know ,can fix,and understand. if i was leasing for 2 yr or win the lottery i might feel different.
     
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  15. rorywquin

    rorywquin Senior Member

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    Got night breakers in my wife's car - they were a good upgrade!
     
  16. ajlsl600

    ajlsl600 Senior Member

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    up to ferry to collect lovelly from her month uk hol next tues night so we will see then
     
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  17. Botus

    Botus Senior Member

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    because they don't know what they are doing...

    there were three reasons on my BMW why I turned it off (and went to an adaptive perfectly judged setting instigated by the operator)
    1) failing to use high beam at low speed (just as you find, its dangerous without it)
    2) it wouldn't dip reliably against massive reflective road signs, so the world's lit up like its firework night and you can't see where you're going
    3) the manual override became a double tap of the stalk instead of once to get it to respond

    On a VW with morphing LED rubbish I found
    1) it didn't move to high beam when in unlit 60 limit road's reliably
    2) it forgot to dip and dazzled everyone,
    3) it picked out lights in homes nowhere near the road on S bends and dipped till you couldn't see where you were going
    4) it was slow to pick up high beam after a passing car had gone by
    5) it dipped too early for on coming cars on twisty roads

    all in all safer to DIY
     
    Last edited: Nov 5, 2019
  18. EmilysDad

    EmilysDad Senior Member

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    It does work quite well on the whole .... mine hasn't failed to dip or select main beam when appropriate. :)
     
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  19. rorywquin

    rorywquin Senior Member

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    Perhaps you should have purchased a MB instead of those lesser vehicles.:) I've never had an issue with mine.
     
  20. LostKiwi

    LostKiwi Senior Member

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    You forgot the "fix for under £20 on the side of the road" bit as well Andy!
     

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