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Thread: Brake light on

  1. 31st July 2020, 07:43 PM #1
    Moggymitch
    Moggymitch is offline Fossicker Supporter
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    Brake light on

    Hi All,

    I realised about a over a month ago that the right hand rear brake light faintly stays on when the car is running and stays on for around 14 minutes from shutting the doors after the engine has been turned off. I am guessing this is the time for the computers to shut down?

    53EA0B63-1AB5-4FD7-A81D-F741F7746EE6.jpg
    When we had the timing belts done the independent mechanic checked the diagnostics but no faults were logged, they suggested it could be a faulty rear light unit and replace the whole thing.

    So finally getting a weekend to look at the cause are there any suggestions on the best place to start looking for the culprit. There is also a second flat pin trailer plug installed under the rear bumper by the previous owner.

    cheers
    Jonathan
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  2. 31st July 2020, 08:16 PM #2
    DiscoJeffster
    DiscoJeffster is offline TopicToaster Subscriber
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    Mine had a light cluster replaced once but I don’t know why that was done.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)
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  3. 31st July 2020, 09:14 PM #3
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    DieselLSE
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    How odd. My guess is that you're right in suspecting the aftermarket wiring connected into the circuit. I'd certainly start by disconnecting it to see if it still happens.
    2013 D4 expedition equipped
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    (previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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  4. 31st July 2020, 09:32 PM #4
    josh.huber Guest
    Do you have or did it ever have electronic brakes fitted, light assemblies can't generate there own electricity. Someone is sending a very very small amount of power to them
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  5. 1st August 2020, 06:01 AM #5
    Moggymitch
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    There is no brake controller fitted and the glow cannot really be seen in daylight.
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  6. 1st August 2020, 06:09 AM #6
    INter674
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    Short circuit prob in the added wiring...disconnect as suggested..
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  7. 1st August 2020, 07:07 AM #7
    josh.huber Guest
    In regards to led. Simple water in the connector is enough to cause that concern
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  8. 1st August 2020, 09:09 AM #8
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    Tombie
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    Something tracking over in second trailer plug.
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