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LED Numberplate Lights staying on

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by sc00byd00byd00, Dec 6, 2010.

  1. sc00byd00byd00
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    sc00byd00byd00 Frank and Beans...............

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    [Dec 6, 2010]
    Anybody else having this issue.

    I initially thought it would just be burning up the residual charge, but checking this morning, the LED lights had been on all night.
    #1
  2. simon.m
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    simon.m Active Member

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    [Dec 6, 2010]
    sounds like they are shorting out mate could be the led its self or the light holder has got damp some how
    #2
  3. sc00byd00byd00
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    sc00byd00byd00 Frank and Beans...............

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    [Dec 6, 2010]
    #3
  4. simon.m
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    simon.m Active Member

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    [Dec 6, 2010]
    maybe badly made ones mate or some thing you can pick them up in halfords i think about 10 pounds ish but they would be better made
    #4
  5. sc00byd00byd00
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    sc00byd00byd00 Frank and Beans...............

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    [Dec 6, 2010]
    Never seen LED bulbs in HALFRAUDS ???
    #5
  6. simon.m
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    simon.m Active Member

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    [Dec 6, 2010]
    they do alot now days mate there are these ones but if you go to there web site and put in car LEDS there is loads

    Halfords | Prism LED Festoon
    #6
  7. simon.m
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    simon.m Active Member

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  8. CHRIS555
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    CHRIS555 DOPE with added OCD

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    [Dec 6, 2010]
    I run the Prism Halfords jobbies too - very happy with them......

    [​IMG]
    #8
  9. MDA
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    MDA sploorer

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    [Dec 6, 2010]
    nice
    but do they mess with the bulb out warnings ?
    #9
  10. simon.m
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    simon.m Active Member

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    [Dec 6, 2010]
    would i be wrong in saying that the number plate lights are not covered by the lights out waring
    #10
  11. sc00byd00byd00
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    sc00byd00byd00 Frank and Beans...............

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    [Dec 6, 2010]
    Dunno mate ?
    #11
  12. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Dec 6, 2010]
    You would be!
    #12
  13. simon.m
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    simon.m Active Member

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    [Dec 6, 2010]
    oh well would not be the first time lol
    #13
  14. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Dec 6, 2010]
    Or the last .... ;)
    #14
  15. simon.m
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    simon.m Active Member

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    [Dec 6, 2010]
    of course not james ;-) all though i dont have full DIS so i can be wrong lol
    #15
  16. CHRIS555
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    CHRIS555 DOPE with added OCD

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    [Dec 6, 2010]
    The only issue is that my light bulb out warning dash light pops up but as soon as i turn the lights on this goes straight away with no issues what so ever
    #16
  17. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    [Dec 6, 2010]
    my LED's are working just fine at the mo, touch wood!
    #17
  18. Xmay4444
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    Xmay4444 On Point!!

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    [Dec 6, 2010]
    I got a number plate bulb out and i aint getting no warnings.
    #18
  19. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Dec 6, 2010]
    Is that standard or retrofit DIS?
    I ran without my bulbs for a couple of days while I was waiting for the new bulb holder to arrive and got fed up of the warning light!
    #19
  20. Woorlord
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    Woorlord shifting to Hyperspace... . VCDS Map User

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    [Dec 7, 2010]
    Both need to fail for DIS to register a bulb out warning - have tested this when I did the Reverse Camera mod.
    FYI: License plate lights are wired in parallel so the DIS sees both bulbs as one.
    #20
  21. sc00byd00byd00
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    sc00byd00byd00 Frank and Beans...............

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    [Dec 8, 2010]
    Any idea's Woodlord why my lights are staying on when ignition and lights are turned off ? Is there a current passing round this electrical wiring, all be it a very small one that is the reason the lights are staying on (but dim)

    An idea the ebay seller suggested would be to get some slightly more expensive ones that have a load resistor built into them (i.e. no error ones) to only light up when they get the voltage required that would normally light up the standard filament bulbs ?

    Does that sound about right ?

    If so, i'm contemplating one of the following ?

    ERROR FREE 3SMD CANBUS 38mm 272 LED FESTOON BULB on eBay (end time 09-Dec-10 15:44:55 GMT)

    239 C5W 272 Dome 36mm LED Festoon no canbus error free on eBay (end time 22-Dec-10 09:12:50 GMT)

    However, there are a few other issues with the wiring on mine that may need replacing pending expert opinion if this is contributary to the cause of the lights staying on ??

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    #21
  22. Woorlord
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    Woorlord shifting to Hyperspace... . VCDS Map User

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    [Dec 8, 2010]
    An LED only requires 20mA of current to illuminate at a reasonable light level so I guess if there is leakage in the driver circuit to the LED then it is possible they will illuminate very dimly if the driver circuit does not have enough proper load drain to switch off.

    Putting a shunt resistor in parallel to the LED's should suck any residual current out of the driver circuit and probably make the circuit switch off properly. A simpler "test" method would be to solder some wires to a working number plate bulb and attach this to the license plate terminals (hide it around the back somewhere taped up) - this will fool the driver circuit in working properly and your LED's should go out when the lights switched off. One bulb should be sufficient. If this works OK we can then get a power resistor to take the place of the bulb for a more permanent solution.
    Last edited: Dec 8, 2010
    #22
  23. quattro tony
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    quattro tony Member

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    [Dec 8, 2010]
    Strange that one. Ive got some led lamps on mine and they work 100% fine. The only thing i can think of is i had a a3 in the past that the battery kept going flat and eventually i traced it to a faulty light switch which was somehow just putting the number plate lamps all the time engine off and running and draining the battery. I would put a multimeter between the terminals and see what voltage you are getting there and maybe swapping the bulbs back to std just to eliminate a bulb fault.
    #23
  24. Woorlord
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    Woorlord shifting to Hyperspace... . VCDS Map User

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    [Dec 8, 2010]
    If you measure the in-line current (DVM to Amps or mA) this will give a better indication of what the battery current drain is through the number plate lights. Voltage is not really an issue!
    #24
  25. sc00byd00byd00
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    sc00byd00byd00 Frank and Beans...............

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    [Dec 9, 2010]

    Ok.... say that again in laymans terms........ I'm not very technical when it comes to stuff like this.

    Not really into fiddling like that if i'm honest, prefer the plug and play improvments.

    Can I not just buy a LED bulb that had all that electronic gubbins already incorporated into it ? Not really bothered if it costs more
    #25

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