2006 - E92 335i - Repeated intermittent lights failing warnings occurring

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  1. 2006 - E92 335i - Repeated intermittent lights failing warnings occurring 
    #1
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    jimbobuk's Car Details
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    I'm heading into my first winter with my car, and so far *touch wood* everything's going ok... the elephant in the room of handling on ice/snow I'll leave for another time, and to keep me awake at night

    I've noticed over the past few months a niggle that i'd like to hear opinions on from you guys.

    Basically I'll be driving along and out of the blue it'll pop up errors like the following
    • Indicator light has failed
    • fog light has failed
    • etc

    I've had this happen most of the time when whatever light that is described isn't even being operated on at the time.. ie. I'm not indicating, or my fog lights aren't on. I'm presuming it has some testing electronics that it runs intermittently which is reporting the failure.

    When i first got this error i was nervous and when i arrived at my destination i tried to test it, yet couldn't find a problem with the lights in question.

    Since then i've noticed that mostly I can actually activate the system described and it typically then will clear the warning, including the ! in the front instrument panel window. It makes me assume that it's actually able to detect the light is working, and therefore clears the error.

    My question is, is this something to worry about? Is it just a bit of an issue that these systems have occasionally, or does perhaps the diagnostic system need some potential fixing.

    I've asked a couple of friends with similar 3 series cars of similar age, and none of them have experienced this problem.

    The only thing i can presume is relevant is that i had the battery replaced at a local specialist a few months ago, with a Bosch battery, not a BMW one. I was told it was properly configured and coded etc, but wondered if this could be a cause.

    Any thoughts?

    Cheers in advance!
     
     

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    #2
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    mark@vorny.co.uk's Car Details
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    My old 335i used to throw wobblies when cold similar to that. That was diagnosed by the dealer as a battery on the way out.

    Are you sure, really sure that the battery has been correctly coded ?
    2013, Porsche 911 Carrera 4S, PDK, Sports Exhaust, Chrono, etc, etc

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    #3
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    gunslinger1's Car Details
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    hi guys, i dont think it would be your battery as the programiing you talk about is only for the DME (digital motor electronics ) its this that controls you alternator via a BSD line in conjunction with the IBS (inteligent battery sensor ) , there where a few problems with the light control module on your car as we changed a lot of them for incorrect check control messages , they used to log loads of light faults but the lights would be working . i would have the fault memorys read to see whats stored ,
    regarding your bulb monitoring , theses are monitored all the time the term 15 is on, so you dont have to switch a light circuit on for the car to test it . i hope this is of some help ,.
     
     

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    #4
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    edber's Car Details
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    Its also called the cold check,the car sends a voltage to the bulbs to check them,this happens so fast that you wont see the bulb light up.
     
     

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    #5
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    it used to be 3v on the old systems , but i would imagen it would be less now ,
     
     

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    #6
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    jimbobuk's Car Details
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    Thanks guys... I'd have no idea whether or not the battery was actually coded properly or not. But if we don't think that was even perhaps relevant then fair enough.

    I had one trigger again this morning, at the same point its triggered before. Going round a large roundabout to get on the M1 at reasonable speed and then the right indicator fail warning came on, and i don't think it went away... i'll check when i get back in my car later if there is a problem with the actual indicator... perhaps the motion is putting some stress on a connection doing that turning and somehow causing the fault to be detected... If it keeps happening i'll probably take it in to be looked at. Though whilst all the lights are actually functioning that its claiming aren't i'm less worried.

    Perhaps even the light is very close to actually failing so that its not responding properly though is then actually working when being used normally...

    Who knows.

    Cheers for your help though guys... I just wanted to get a feel for whether a lot of people had experienced it, ie. it was a known issue with these cars, or whether it was something a bit more specific to my car that may actually be wrong.
     
     

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    #7
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    bobdisk's Car Details
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    #8
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    Wonkydog's Car Details
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    I've had a similar problem with the rear lights. Turned out to be the wiring plug to the light cluster. Earth pin takes the power for all the bulbs and burns out.
    Common fault so it seems.
    New wire with crimps from loom to cluster and bypass scorched terminals fixed it.
    Hope this helps.
    Clear your heads and get ready to run.
    Remember, the best times are yet to come.
     
     

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