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LED Headlight Behaviour?

Discussion in 'New A3/S3 (8V Chassis)' started by snakehips, Jan 21, 2014.

  1. snakehips
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    snakehips Active Member

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    [Jan 21, 2014]
    Hi,
    I've had my car for 5 weeks now and still haven't quite worked out how the LED lights should behave. Normal usage is brilliant (literally!) but I still have a couple of questions that others may know the answer to:

    1. What criteria determine when the turning lights come on? They certainly do when I'm going slowly and turning, but they often come on when I am going slowly and not turning. Does even a tiny adjustment of the wheel trigger them? (this question may apply to adaptive Xenon users too).
    2. Apparently LED lights includes "junction lights". I haven't actually noticed this feature yet (but I am notoriously unobservant according to my wife), so again what criteria trigger these? Are they the same lights as turning lights or something else? Maybe they are coming on as junction lights and I think they are turning lights, or vice versa?

    Just trying to understand when and why certain lights are triggered so that I know what to expect.
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  3. andywil13
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    andywil13 Active Member

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    [Jan 21, 2014]
    I have normal xenon lights with the adaptive pack - this i find harder to notice as junctions are generally quite well lit in my area, but I do have 1 junction on my way home and as I slow down they come on as I approach the junction. In my road at home, as its not a junction, they only come on left or right as i'm turning the wheel to park

    hope that helps
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  4. Cumbrian_bob
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    Cumbrian_bob Member

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    [Jan 21, 2014]
    I havnt really worked it out, if its indicators or when moving the steering wheel.

    The all waether (front fog lights but not fog light) button does put the lights on and adds a good deal of width to the light. Still even after reading the manual I am not sure when they should be used. Probably the same as when you would use normal fog lights???
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  5. snakehips
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    snakehips Active Member

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    [Jan 21, 2014]
    I think it's definitely the steering wheel, but speed must also be a factor.
    Had bad fog today so used the "all weather" light for the first time. An extra bulb does come on but tbh couldn't really see much difference since the regular headlights are so good.
    #4
  6. snakehips
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    snakehips Active Member

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    [Jan 21, 2014]
    Thanks. So do the junction lights come on simply because you are braking to below a certain speed? Maybe this is what I am seeing.
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  7. the_lecht_rocks
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    the_lecht_rocks Well-Known Member

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    [Jan 21, 2014]
    How good are the actual high beam and dipped beam operation if the Led lights folks ?
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  8. snakehips
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    snakehips Active Member

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    [Jan 21, 2014]
    I can't fault the standard high and dipped beam. The pure white light is so much better than anything I've had before. Even the front indicators light up road signs 50 metres away.
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  9. the_lecht_rocks
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    the_lecht_rocks Well-Known Member

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  10. Itguy
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    Itguy Active Member

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    [Jan 21, 2014]
    The junction lights are connected to the nav into aren't they?
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  11. snakehips
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    snakehips Active Member

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    [Jan 21, 2014]
    Maybe. There is mention of something like that if you have Connect, which I don't. But does lack of Connect mean no junction functionality?
    #10
  12. jet_andy
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    jet_andy Member

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    [Jan 21, 2014]
    I assume the LEDs are the same as the xenon - the cornering lights also come on when you approach a junction at low speed, but both sides at the same time. It's linked to the Sat Nav. Can't remember exactly what they call it in the manual (don't have it to hand) but I think it's something like Intelligent lighting system.Look it up.

    Easy to see them both come on when you pass a junction at low speed if you have xenon - they're standard halogen bulbs that have a distinct beam.
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  13. snakehips
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    snakehips Active Member

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    [Jan 21, 2014]
    Ah, so what I thought we're turning lights could have been junctions lights. I can't see the nearside one so can rarely tell if they are both on. They come on as you pass all junctions?
    Maybe I am blind as I didn't see anything in the manual. I'll look more closely tomorrow.
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  14. cemerson
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    cemerson Well-Known Member

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    [Jan 21, 2014]
    I think your question 2 answers your question 1...
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  15. J6YAK
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    J6YAK Active Member

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    [Jan 21, 2014]
    I think speed, steering position and possibly brake position all play a part in switching on these extra lights but not entirely sure how, ive noticed these on both sides but only when turning, defo nothing to do with Nav, tech pack or connect as i dont have any of these!!.
    All I know is the LED lights are awesome and well worth speccing. The light output and colour are better than xenons and these turning/ junction lights whatever they are called are a good feature.
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  16. cemerson
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    cemerson Well-Known Member

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    [Jan 21, 2014]
    It is to do with nav if you have it - I think it states so in the manual. If you don't, there is probably some backup system in place that comes into play using these other factors.

    And the turning lights come with Xenons too!
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  17. snowfree52
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    snowfree52 Full LED baby !

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    [Jan 22, 2014]
    You nailed it ;)

    when you are at a junction, the car will turn on both turning lights, transforming them into junction lights
    #16
  18. snakehips
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    snakehips Active Member

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    [Jan 22, 2014]
    I did suspect question 2 was answering question 1 but as I said I can only see the offside light come on from my driving position so to me it looks like a right-turn light.
    So just to confirm, you say that at low speeds the junction lights will come on as I approach T junctions and crossroads and even as I pass side roads?
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  19. snowfree52
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    snowfree52 Full LED baby !

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    [Jan 22, 2014]
    yes

    T junctions definitely, for the rest, I think yes but wouldn't bet my hand, as most of the time I don't really look at it
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  20. jet_andy
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    jet_andy Member

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    [Jan 22, 2014]
    And as for your turning lights, they work when stationary (xenons do anyway) so you can start up in the drive, turn the headlights on and turn the wheel to see at what point they come on. Doesn't need much angle.
    #19

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