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Buick Forum: Intermittent 3rd Brake Light Operation
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  1. #1
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    Dec 2017
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    Intermittent 3rd Brake Light Operation

    Back with another thread, i own a 2005 lacrosse. Up until recently my 3rd brake light (LED of course) doesn't work when i hit the brakes. Now i've noticed in super cold weather anywhere from 5° to 20° degrees it works but as it gets warmer including the interior of the car it doesn't seem to work properly. Being LED it'd have to be replaced as a whole assembly. But i have confirmed it's an iffy connection somewhere because they light up sporadically. Any ideas?? Bad connection?? Thanks!! P.s. my regular brake lights DO work.

  2. #2
    Join Date
    Oct 2017
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    Lawrencvile, Ga
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    Re: Intermittent 3rd Brake Light Operation

    It sounds like you may have to just replace the third brake light assembly. My 2006 Cadillac Escalade third brake light just stop working and I had to replace the unit. Very common issue for 2002-2006 GM SUV's.

    I assume the same for your 2005 Lacrosse, however it would be a wise move to check the connections before buying a new one.
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  3. #3
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    Re: Intermittent 3rd Brake Light Operation

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    I'll definitely check that out! hopefully it's nothing major!

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