Notices
 

  

User Tag List

Thread: S6 C6 only 2 out 5 DRL LEDs light up

Results 1 to 8 of 8
  1. S6 C6 only 2 out 5 DRL LEDs light up 
    #1
    Join Date
    May 2015
    Location
    Warrington England
    Posts
    4
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    If you like a puzzle then you'll LOVE this. I will be amazed if anyone knows why this is happening.

    On my 2006 S6 C6 the right DRL only lights 2 of it's 5 LEDs.

    Put the left DRL on the right hand plug and all 5 LEDs light.

    Put the right DRL on the left hand plug and only 2 LEDs light.

    "EASY it's a fault on the left DRL!" EXCEPT remove it and test it directly on a 12V battery and it lights all 5 LEDs.
    (There are 3 pins on the DRL. Positive, ground and 'control'; where 'control' (I believe) is a signal line from a module to tell the DRL to dim itself. All 5 LEDs light whether 12V are fed just to positive or to positive and 'control')

    Any ideas? Thx.
     
    0 0 0
     

  2. Re: S6 C6 only 2 out 5 DRL LEDs light up 
    #2
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    36,951
    Post Thanks / Like
    Blog Entries
    2
    Mentioned
    42 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    978 Post(s)
    Private message me the cars reg number please.
    If you care about the future of the planet, read this and watch the video

    https://www.bosch.com/stories/synthetic-fuels



    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
    0 0 0
     

  3. Re: S6 C6 only 2 out 5 DRL LEDs light up 
    #3
    Join Date
    Jul 2013
    Location
    UK
    Posts
    1,167
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    64 Post(s)
    Quote Originally Posted by ricxk916 View Post
    If you like a puzzle then you'll LOVE this. I will be amazed if anyone knows why this is happening.

    On my 2006 S6 C6 the right DRL only lights 2 of it's 5 LEDs.

    Put the left DRL on the right hand plug and all 5 LEDs light.

    Put the right DRL on the left hand plug and only 2 LEDs light.

    "EASY it's a fault on the left DRL!" EXCEPT remove it and test it directly on a 12V battery and it lights all 5 LEDs.
    (There are 3 pins on the DRL. Positive, ground and 'control'; where 'control' (I believe) is a signal line from a module to tell the DRL to dim itself. All 5 LEDs light whether 12V are fed just to positive or to positive and 'control')

    Any ideas? Thx.
    You got yourself muddled there, do you not mean that the right hand DRL has fault within it.

    The control line is a LINBUS signal, as I read it the signal wire/connection within the DRL is corrupting the operation of the LED's as you have proved that the car is good by using the other sides DRL in the right hand position.

    Have you had any water ingress in the DRL as this could have put corrosion on the wiring connections causing tracking and the lighting of 2 LED's only? When the wire is disconnected the LED's work as they should as you proved with the bench test.

    One option that you could try is to remove the signal wire pin from the connector on the car and test it to see if the 5 LED's light up.

    If they do then the DRL needs to be replaced or opened up and checked.
    Dan
    2009/2010 2.0 TDIe SE
     
    0 0 0
     

  4. Thumbs up Re: S6 C6 only 2 out 5 DRL LEDs light up 
    #4
    Join Date
    May 2015
    Location
    Warrington England
    Posts
    4
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Wow Dan, thanks! Correct on every point.

    I did mean it's a fault on the right DRL.

    I have fixed a CANBUS issue before but I was ignorant about LINBUS, so I've Youtube'd up and understand there will be a LINBUS slave module within the DRL itself that is corrupting the signal from the master module. Looks like if I had an oscilloscope (or 'PicoScope' a guy uses on Youtube) I would be able to confirm the signal being sent on pin 2 of the plug; but I don't.

    As the DRLs are stupidly expensive it makes sense to at least open it up and see if the slave module can be identified and repaired. I have fixed electronics in the past that just had a 'dry joint'. Fingers crossed.

    There is no evidence of water ingress. The lens isn't even cracked; miraculously given where it lives.

    I will post an update.

    Thx, Ric.
    06 S6 C6 4F5
     
    0 0 0
     

  5. Re: S6 C6 only 2 out 5 DRL LEDs light up 
    #5
    Join Date
    Aug 2016
    Location
    Lisburn
    Posts
    269
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    26 Post(s)
    You stuck 12V on and all worked - but as i am sure you have seen on top gear that lights flash on camera, to dim they dont add a resistor or turn down the voltage they pulse a signal at it, but it is that quick the naked eye doesn't catch it we just see a dim light. eyes only work at 80Hz
    so sticking the 12V on solid is like punching it, therefore i am going with dry joint or poor IMC - same thing just not visible, not letting the signal through. take her apart and reflow. Fingers crossed.

    DIY Scopes can be picked up for cheep the pico scope is not a scope - they will say that themselves - yes it captures signals but if you use a scope day in day out you cant just pick up a pico and run with it - there is a learning curve as it uses an app.
    you can pick a scope ( think thats what this is) for dirt cheap, KKmoon DSO138 2.4 inch TFT Handheld Digital Pocket Oscilloscope Kit SMD Soldered + Acrylic DIY CASE Cover Shell for DSO138: Amazon.co.uk: DIY & Tools < wouldn't use it for ultimate measurement.
    Stewart
    2007 A6 quattro 3.0 TDI Manual
    1986 coupe quattro (kv) square wheels.
    1972 mini 1400 100BHP A series
     
    0 0 0
     

  6. Re: S6 C6 only 2 out 5 DRL LEDs light up 
    #6
    Join Date
    May 2015
    Location
    Warrington England
    Posts
    4
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Thx Stewart. I saw the square wave on a LINBUS Youtube tutorial but I hadn't clicked on the signal pulsing to dim the light. I would love to get into the unit and at least try to reflow the solder BUT I have tried baking it in the oven (100C) to soften the 'glue' with no effect. It looks like a plastic weld to me between the back of the lens and the carrier. I have also had a go with my Dremmel but it would take considerable damage and time to get the unit open. So, I'm probably going to shell out for a replacement. But at least I learned a bit along the way.

    Thx, Ric.
    06 S6 C6 4F5
     
    0 0 0
     

  7. Re: S6 C6 only 2 out 5 DRL LEDs light up 
    #7
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    36,951
    Post Thanks / Like
    Blog Entries
    2
    Mentioned
    42 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    978 Post(s)
    Headlight part number 4F0 941 030 EF and 728.22 inc VAT.
    If you care about the future of the planet, read this and watch the video

    https://www.bosch.com/stories/synthetic-fuels



    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
    0 0 0
     

  8. Re: S6 C6 only 2 out 5 DRL LEDs light up 
    #8
    Join Date
    Jul 2013
    Location
    UK
    Posts
    1,167
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    64 Post(s)
    Dan
    2009/2010 2.0 TDIe SE
     
    0 0 0
     

Similar Threads

  1. Rear light LEDs
    By Quatrelle in forum Passat - B6 Forum - 2005 - 2010
    Replies: 6
    Last Post: 18-01-2019, 01:57 PM
  2. Rear light LEDs
    By Quatrelle in forum Passat - B6 Forum - 2005 - 2010
    Replies: 2
    Last Post: 18-10-2018, 07:50 PM
  3. s4 b8 replacement rear fairy light leds to light bar style
    By oracpb in forum Audi A4 - B8 Forum - 2008 - 2015
    Replies: 1
    Last Post: 18-03-2016, 08:14 AM
  4. Question 2009 MY Rear light LEDs failing
    By blue10 in forum Audi A3 - 8P - 2004 - 2012
    Replies: 8
    Last Post: 29-06-2013, 07:21 AM
  5. T5 Transporter High Level Brake light, LEDs ON
    By sti5300 in forum The Commercial Range
    Replies: 0
    Last Post: 18-12-2011, 08:18 PM
Tags for this Thread

View Tag Cloud

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


 



  


Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.


VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.


Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.


All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


PLEASE NOTE - PERSONAL ABUSE, ABUSE AGAINST THIS OR ANY OTHER WEBSITE OR ANY COMPANY WILL NOT BE TOLERATED. OFFENDERS WILL BE MODERATED OR EVEN BANNED.


This website and forum are best viewed at a minimum resolution of 1024 by 768.



  



- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - Scania - MAN - Ducatti - VW Audi Forum -


- www.vwaudiforum.co.uk - www.vwaudiforum.co.uk -