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Thread: Canbus and LED bulbs

  1. #1
    Regular Member Derek Mc's Avatar
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    Default Canbus and LED bulbs

    OK Been an owner now for a wee while (if May 2010 till now counts as a wee while) and I was always curious about the LED bulbs and errors thing as to why this may happen.

    It took a failed bulb to get myself a partial at least answer.

    If you look at the bulbs in the rear cluster they are all 21W single filament, this means that for the rear lights normal operation w=they are being held back to look like a 5W rear filament would only when the brake is pressed do they brighten up.

    Now I know why getting LED's to work is so darned hard!

  2. #2
    Regular Member Graham's Avatar
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    Vehicle : Focus

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    Dont think all the bulbs are 21w ? Think some are 5w and 10w arnt they? The brake bulbs and fog lights are 21w.

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    Regular Member Graham's Avatar
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    Vehicle : Focus

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    Sorry your right, they are all 21w. Strange, can see where your coming from now.

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    Vehicle : Vauxhall Astra-J

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    That's CANBUS technology for you.

    Also, should a brake light fail, then the 2nd tail light takes over the role of tail/brake light instead.

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    Vehicle : Golf 7

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    Quote Originally Posted by Big Dave View Post
    That's CANBUS technology for you.

    Also, should a brake light fail, then the 2nd tail light takes over the role of tail/brake light instead.
    it's to do with the check pulse that the canbus system puts out when the ignition is on and lights aren't.

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