2003 E46 320i - Rear Brake Warning Light

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  1. 2003 E46 320i - Rear Brake Warning Light 
    #1
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    clint4810's Car Details
    Model of Car:
    320i Sport
    Year of Manufacture:
    2003
    Transmission Type:
    Manual
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    Can anyone help? Every time i turn on my E46 320i the rear brake warning light comes on stating that i have a bulb out. This stays on until i turn on my main headlight switch this then extinguishers after approx 30 seconds. All my bulbs are fine i think the problem may lie either with the Auto headlight switch or possibly an earth fault. Has/does anybody know anything to help....PLEASE!
     
     

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    #2
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    Does it happen consistently or on the odd occasion?
     
     

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    #3
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    sudnut's Car Details
    Model of Car:
    318i
    Year of Manufacture:
    2002
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

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    I had this same problem on my 2002 E46 318i. There's plenty of info on the net. Basically for me the solution was:

    - Inspect the rear light cluster (left or right) accessible from inside the boot
    - With the ignition off, unplug the rectangular socket. Mine was melted around the black ground wire connector on both left and right clusters.
    - Pull out the ground cable from the rectangular socket by lifting the corresponding tab.
    - Cut this terminal off and strip the wire to solder on a wider female spade terminal which is to be connected to the available ground tabs on one of the steel tracks on the cluster.
    - You should end up with the original rectangular connector and a separate ground cable to plug into the unused tab in the cluster (There are 2 0r 3 different sizes in there)
    - The above procedure fixed one of my rear lights. The right side still caused the fault light on the dash to stay on. I checked my work as well as all the bulbs which where fine. I was puzzled for a while until I read somewhere on the net that the type of bulb can make a difference. Sure enough one bulb in the cluster was a different brand than all the others. Even though it had the same rating (12V 21W I think) and was functioning, it was responsible for the fault. Using a multimeter, I compared the resistance of this one and the good bulbs and the good bulbs had a lot less resistance. (Can't remember the values but its obvious if you do it). The originals are Philips made in France and the dodgy one was Narva brand. I ended up replacing it with a cheapo Excelite brand which had a similar resistance value to the Philips ones. So I guess its not So I guess its not a quality issue. Hope this helps someone and sorry if I missed something.
     
     

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    #4
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    elty's Car Details
    Model of Car:
    118d
    Year of Manufacture:
    07
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    I had this problem, the fault was that the terminal block, femail part had opened up slightly,
    All I did was closk the spade connectors slightly with a knife and that was it,
    No more troubles since.
     
     

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    #5
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    peanut's Car Details
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    1995
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    i bet its a number plate bulb that is out.............let me know wont ya!!!
     
     

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    #6
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    elty's Car Details
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    Car Body Type:
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    Any update on problem?
     
     

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    #7
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    Ronnie's Car Details
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    Common problem, as shown here, E46 2002 325 Rear light fault
     
     

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