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Thread: Replacement LED brake light problem

  
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    Replacement LED brake light problem

    Decided to buy some LED brake lights for the main brake lights. Put one on last night, compared the LED one with the original one. Both exactly the same so replaced the other original one and checked. All looked OK.

    This morning when driving to work, the ECU light came on after starting the engine and the after market cruise control refused to set the speed but did turn on. Found that if I used the brake for more than 3 seconds then ECU light would go off. Release brake and ECU light comes back on after a second.

    On arriving at work. I had a look at the brake lights when in sidelight mode, found that they are quite dim with the ignition on, but normal brightness when ignition is off. When brake pedal is pressed, both lights are bright, no matter whether ignition is on or off.

    The lights came with a resistor each that I didn't fit. I assume fitting one or both will make the ECU light stay off and cruise control work, but will it keep the lights bright when ignition is on?

    Secondly why cruise control won't work and ECU is bothered about 2 "blown" bulbs? Safety reasons?

    Thanks muchly for help in advance!

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    Autosparks's Avatar
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    Yep yu need to fit the resistors, one in each side

    The ECU and cruise control isn't seeing a earth on the brake light wire so thinks the brake switch or worse could be faulty
    Want a professional job done on fitting your aftermarket electrical accessories? PM me for a quote
    Electrical fault finding also taken on
    Located in N/W London HA3, and willing to travel within reason





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    Brilliant, thanks!

    Will fitting the resistors solve the problem of the lights being dim when ignition is on?

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    ah, that's why my cruise control doesn't work either!?

    What resistors are they? My LEDs were ebay Hong Kong specials for £3, never heard owt about resistors.

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    Fitted the resistors today and still have the same problem I connected them to the GreyBlack and GreyRed wires.

    What could be the cause here?

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    lee gsi's Avatar
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    Do you have a link to the resistors and why did you you choose those 2 wires to connect them too?
    The truth is always the truth even if you haven't realised it yet...

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    They came with the bulbs. Thinking about it now, the problem goes away when I press the brake pedal, so I guess I should have connected them to the stop lamp wires, not the side lamp wires...?

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    If you want the led brake light bulb to work then fit one side of the resistor to the live wire going to the led bulb (Not sure what colour) and the other side of the resistor to earth (Or brown wire)

    Also make sure the resistor is also bolted to metalwork as they can get very hot.
    The truth is always the truth even if you haven't realised it yet...

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    Which bulb wire? The tail or the stop lamp? The LED bulb is both of these. Also, how do I bolt the resistor to the metalwork, as it's a large toblerone shaped resistor.

    Thanks very much for your help!

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    Any pictures of the resistor?

    Where is the bulb being used on your car? If its the stop lamp then it needs to go on the stop lamp wire, If its being used for sidelights then wire it on the side light wire.
    The truth is always the truth even if you haven't realised it yet...

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