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  1. #1
    Danny-boy's Avatar
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    CANBUS Bulb Warning

    Hi all,

    With regard to the Canbus bulb failure warning, I'm interested to know how this works.

    Does the system look for a certain resistance, or does it look for a certain "minimum" resistance?

    I plan to install LED sidelight bulbs, and also tap some DRL's into the circuit. I'll measure the resistance of the original bulb, and the LED's and get a resistor as close to the difference as possible.

    How accurate do I need to be? I don't want to be too far over the resistance of the standard bulb due to heat, but how accurate do I need to be?

    That is of course assuming it's only resistance that is monitored.

    Cheers

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  3. #2
    B7_FUR's Avatar
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    T8ups does some led sidelights with built in halogen bulbs so no errors come up, you could then get them activated as DRL's. check out his members page pal.

    CREE 501 Sidelight
    Last edited by B7_FUR; 29th January 2013 at 09:26. Reason: Added link

    A4 Avant B7

    LED Rear Lights - Mesh Grill - SLC Splittler - Ice White Fogs - Tints - Devil Eyes - Ambient lighting - LED interior


  4. #3
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    CANBUS Bulb Warning

    Thanks mate, but like I said, I'm wiring DRL's off the sidelight circuit as well.

    Just want to know if I need an "exact" resistance or a "minimum" resistance.

    Cheers

    Dan

  5. #4
    jjmurphy21187's Avatar
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    I always though it worked on current draw? If a bulb blows there is no current due to open circuit, if an LED bulbs is used there is also no current due to the minimal power required for the LED to illuminate. Therefore an additional resistor draws the correct power it removed the dash error.

    Overall I would think that you'd need to get it roughly correct, but given the tiny amount of power that LEDs actually use just use a 5w load resistor and this should get rid of any errors.

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  6. #5
    NOZ
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    Quote Originally Posted by jjmurphy21187 View Post
    I always though it worked on current draw? If a bulb blows there is no current due to open circuit, if an LED bulbs is used there is also no current due to the minimal power required for the LED to illuminate. Therefore an additional resistor draws the correct power it removed the dash error.

    Overall I would think that you'd need to get it roughly correct, but given the tiny amount of power that LEDs actually use just use a 5w load resistor and this should get rid of any errors.
    Just buy canbus error free led bulbs i have and they work fine i have just got the same but for the indicators but now need to purchase one of these
    3 Pin Electronic LED Flasher Relay Fix Turn Signal
    Brand new and high quality
    3 pins electronic LED flasher relay (CF13JL02)
    It can replace the normal thermal flasher
    It can solve the turn signal problems such as hyper flashing, no flashing or stop bulbs blowing
    Plug and play
    12V, 0.02-20A
    3 Pin Electronic LED Flasher Relay Fix Turn Signal
    Brand new and high quality
    3 pins electronic LED flasher relay (CF13JL02)
    It can replace the normal thermal flasher
    It can solve the turn signal problems such as hyper flashing, no flashing or stop bulbs blowing
    Plug and play
    12V, 0.02-20A

    hopefully this will sort out the rapid flashing

  7. #6
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    Danny Boy.

    i will sell you one of these - Canbus sidelight loom. Get rid of that Error!

    but them into 2 so you have 1 on each side, wire them to the new circuit you make and hide it away with a 501 halogen bulb in there, error wont appear as the car will see a halogen connected so no errors. jobs a good un.
    SLOW REPLIES BETWEEN 22nd - 30th June due to been out the office, please bare with me. Thanks


    Bi Xenon Projector kits starting at £79.99 per pair.

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  8. #7
    Danny-boy's Avatar
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    CANBUS Bulb Warning

    Cheers mate, but it seems I was worrying for nothing.

    My car does not monitor bulbs by the looks of things.

    Dan

 

 

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