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Bulb Warning lamp, resistance sensitivity

Discussion in 'E90/E91/E92/E93 (2006-2011)' started by cohland, May 26, 2009.

    cohland guest

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    My 2007 E92 Coupe was showing intermittent bulb warnings, which I finally determined was one of the 16w brake lights (the one in the fender). It was working, but the bulb had a "shadow" whereas new ones are perfectly clear. I measured the resistance at about 1.9 ohms, and a new one measures about 1.6 ohms (assuming I can read the meter). I swapped the bulb. Is a resistance difference that small sufficient to make the system think it was seeing a bulb failure?
    • Member


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    Many prior BMW models are known for being overly sensative in measuring bulb circuit tolerances - so the answer is "yes", even though I can't say that I've checked this particuar model.

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