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Thread: LED side lights and canbus wiring - side lights on all the time

  1. #1
    M7R
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    LED side lights and canbus wiring - side lights on all the time

    I have managed to get rid of the crappy yellow bulbs with some nice white xenon bulbs and all is well, but the big left down was the yellow side light bulbs, so I had the brillaint idea of a pair of white LED ones, using 4 tiny LED bulbs, and they did look the dogs danglies! plus they were brighter and I hate not being seen as I do alot of night driving.

    the down side is the bulbs are permantly on, when the lights are turned off the LEDs glow dim on about 1/2 power. Is there anways I can fix this? im guessing I need a resistor of some sort inline?

    cheers

    Karl.

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    PetrolDave's Avatar
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    The LEDs are on all the time because the bulb failure check actually puts out enough voltage to turn the LEDs on.

    If you put the LEDs in series to stop them glowing then you'll get a bulb failure warning, so you'll need a parallel resistor to stop the warning.
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    M7R
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    Quote Originally Posted by PetrolDave View Post
    The LEDs are on all the time because the bulb failure check actually puts out enough voltage to turn the LEDs on.

    If you put the LEDs in series to stop them glowing then you'll get a bulb failure warning, so you'll need a parallel resistor to stop the warning.
    cool, any idea what value of resistor is needed?

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    The sidelight bulb is 21W IIRC, and the LEDS will take only a fraction of that so you need a resistor that will draw say 15W - which means a resistor of about 10 ohms.
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    M7R
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    Quote Originally Posted by PetrolDave View Post
    The sidelight bulb is 21W IIRC, and the LEDS will take only a fraction of that so you need a resistor that will draw say 15W - which means a resistor of about 10 ohms.
    side lights are 5w, so i guess ill assume the resistance from the leds can be egnored.
    mattc1 likes this.

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    youll still need to resist them, i think i put 2k across mine to stop the faults, mine used to flash.
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    Yeah - I also installed resistors, but also moved the position of the sidelights whilst I was at it....


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    M7R
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    can anyone tell me for sure what resistor they used and exactly how they installed it? as I fitted a 2k ohm resistor accross mine today (crudely done by wedging it down the side of the side light bulbs but it did make a connection and it was out fo the car to see if it worked) and it wouldnt work, to start with one light was dimmer than the other only getting 10v, then the car chose to stop one light as it thought the bulb had blown! then after taking the battery off and back on I got it to work but they would come on, flicker a couple of times and then go out.

    now the fact they go out does that mean that theres too much resistance? i reeaaallyyy want my lights work as everything else is done now so these are really leffing the front of the car down,

    cheers

    Karl.

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    Quote Originally Posted by M7R View Post
    now the fact they go out does that mean that theres too much resistance?
    Yes, you need a much lower value than 10K ohms.

    I've seen one person saying that 2k ohms worked for him on the sidelights. I'm surprised that high a value is OK, personally I'd expect a value below 100 ohms to be required.

    What you want is the combination of the LEDs and the resistor to take about half the current that a bulb would - that's usually enough to make the bulb failure system think everything is OK. If you assume the LEDs take nothing (an LED takes 20-50mA, a bulb takes 10-100 times that so is a fair simplification) then you can work out what value resistor you need -> R = V squared (i.e. 144) divided by (half the bulb power).So for a 5W bulb you want a resistor of about 30 ohms.
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    M7R
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    Quote Originally Posted by PetrolDave View Post
    Yes, you need a much lower value than 10K ohms.

    I've seen one person saying that 2k ohms worked for him on the sidelights. I'm surprised that high a value is OK, personally I'd expect a value below 100 ohms to be required.

    What you want is the combination of the LEDs and the resistor to take about half the current that a bulb would - that's usually enough to make the bulb failure system think everything is OK. If you assume the LEDs take nothing (an LED takes 20-50mA, a bulb takes 10-100 times that so is a fair simplification) then you can work out what value resistor you need -> R = V squared (i.e. 144) divided by (half the bulb power).So for a 5W bulb you want a resistor of about 30 ohms.
    brillaint, Ill see what we have at work, or failing that a trip to rs is in order.

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    M7R
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    still I keep going.....

    I tried a 27 and the resistor over heated when the side lights were on started to smoke! this was a RS resistor from work.

    would I be better trying a 33 ohm resistor? ive seen on ebay that they do resistor for my problem and they are only 25ohm though, but do come with a big heatsink..

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    Better big heatsink than melted headlight or worse melted car, you need to get a few at different rating & try them & check the heat of them to make sure its not a danger to the car of course.

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    Quote Originally Posted by M7R View Post
    I tried a 27 and the resistor over heated when the side lights were on started to smoke!
    You not only need the correct resistance value you need the correct wattage rating of the resistor - sounds like you used to low a wattage rating...

    A 27 ohm resistor will dissipate about 6W, so you need a resistor of at least that and probably a 10W is the one to go for.
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    Sorry to hijack a thread...

    I have an A6 now, and am in the process of finishing the S6 DRL mod.

    Currently, I am getting the bulb failure warning - so I need a resistor.

    As my LEDs replace a 55 watt lamp, I am trying to determine what size resistor I need, and whether i need to install in series or parallel.

    I have a couple of 2R7 50W resistors in the garage, and as they are set in a nice big heat sink, I would like to use them if possible... however, I think they might not be heavy enough.

    Any advice would be appreciated

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    I bought some canbus warning bulb.And I put it into my car as test.It can work well.If you are looking for the canbus led.You can contact with you.I can help you find the manufactuerer. nordy@dgruidi.com

  17. #16
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    i fitted all this to my car and have run it now for a few months, i did a how to with links to all the correct bits of kit at the cheapst prices i could find
    do a search for my how to thread
    :-)
    NOW FOR SALE
    Audi A4 Avant S-LINE 2.0 TDI
    BOSE - PARKING SENSORS front and rear - ANGEL REMAP to 183bhp
    LED NUMBER PLATE LIGHTS, HIDS, LED SIDE INDICATORS, LED SIDELIGHTS,19x9 BENTLEY'S, S4 345 MTEC Drilled/grooved Disks -35 on H&R SPRINGS, RS4 REAR ARB RS4 Grille FULL VCDS LED RNS-E DECTANE LED REAR LIGHTS

    TO DO:
    NOTHING - Am i finished really ??

  18. #17
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    Model: canbus T10-WG-8x3528SMD
    Led Quantity: 8 pc 3528 smd
    Lamp Socket: wedge(canbus led)
    Emitting Color: white, warm white, blue, green, red, yellow
    Available Voltage(V): DC12/24V
    Luminous intensity:white 65lm
    Average life time: ≥50, 000 hours

    BMW Canbus Led >T10 Series

    Super Bright 360-degree shine SMD (SMT) Festoon LED bulbs with built-in load resistors,specially designed for European vehicles such as Mercedes, Audi, Volkswagen, Porsche or BMW, etc.
    These OBC Error Free T10 Wedge LED bulbs will replace the stock 168, 194, 2825, 2821 or W5W bulbs.
    The length of this T10 LED bulb is approx 1.15 inches. Since this T10 LED bulb is slightly longer than the stock wedge tungsten bulb, so buyers must make sure the this T10 SMD LED bulb can fit into the housing before buying.
    Each LED bulb equips with 8 pieces High Power 1210 SMD CREE LED Chips, with built-in Load resistors, so they will work properly for European vehicle's parking city lights (position lights), sidemarker lights such as Mercedes, BMW, Audi, etc.


    We have conducted a series of long tests base on a 2004 Mercedes E500, a 2006 Mercedes SLK350, and a 2008 Mercedes CLS500. The LED bulbs will light up perfectly and stay on error-free without flickering.

    W5W canbus led light
    Our products are up to European ROHS standards.We will ensure that the products we sell will be seldom heated, high brightness, normally use ultra-long period of time


    http://www.dgruidi.com/en/can%20bus%20led-184.html

    www.dgruidi.com

  19. #18
    PetrolDave's Avatar
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    ^^^^^^^^^^^^^^^^^^^^^^

    Looks like a blatant commercial post to me...
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  20. #19
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    They also dont work !!! you still get the warning - trust me i tried all sorts of combs - the only way tat worked was to use resistors
    NOW FOR SALE
    Audi A4 Avant S-LINE 2.0 TDI
    BOSE - PARKING SENSORS front and rear - ANGEL REMAP to 183bhp
    LED NUMBER PLATE LIGHTS, HIDS, LED SIDE INDICATORS, LED SIDELIGHTS,19x9 BENTLEY'S, S4 345 MTEC Drilled/grooved Disks -35 on H&R SPRINGS, RS4 REAR ARB RS4 Grille FULL VCDS LED RNS-E DECTANE LED REAR LIGHTS

    TO DO:
    NOTHING - Am i finished really ??

 

 

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