2002 325i e46 Strange Electrical issue(FIXED)

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  1. 2002 325i e46 Strange Electrical issue(FIXED) 
    #1
    Bimmer Fan
    Car Details
    Denson's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    2002
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

    Join Date
    Feb 2009
    Location
    UK
    Posts
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    I've just got home after being recovered from a breakdown.

    For the last couple of months my heater fan has behaved erractically, at random and not normally for long periods. The display show no change when it happens, but you could hear it blowing quickly from slow to a slightly faster speed when set to Auto. No big problem I thought. I'll just wait for it to stop working and I'll get the Final Stage Resistor replaced. Also, my air conditioning pump has been a bit noisey since getting the system regassed 6 weeks ago, but works great.

    Then two days ago after being nearly stationary in a traffic jam for 45 mins (probably the longest it's had to cope with) the radio volume faded and the red battery light came on, just for 3 seconds as I got to the front of the jam and drove off, and everything was back to normal.

    Today after doing another 50 miles or so since that slight hickup, I get all sorts of problems. I was cruising along the motorway when suddenly the battery light came on again, the auto gearbox warning came on, and the car went into limp mode with the general warning amder ! triangle light on.

    I pulled over, turned off, waited 2 mins, restarted the engine and was able to crawl until you feel it go into second gear and then it all happens again. I called for assistance. 90 mins later when they arrive we try to start the engine to get it onto the flatbed and all the lights flicker and it won't even turn over. The car is now sitting on my driveway with a completely dead battery.

    Any ideas? Alternator? FSR? Bad earth/connection? Clearly it's an electrical fault, rather than a gearbox failure, which I guess is a relief. It's a 2002 E46 325i Auto. Owned for 18 months. All been good until now.
     
     

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  3.  
    #2
    BMW Maestro
    Car Details
    mikesmith2's Car Details
    Model of Car:
    520i SE
    Year of Manufacture:
    2002
    Transmission Type:
    Auto
    Car Body Type:
    Touring

    Join Date
    Feb 2009
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    Reading.
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    I would start with the alternator.
    Test the output power and go from there.
     
     

  4. The Following User Says Thank You to mikesmith2 For This Useful Post:

    gildersol (27-02-2009)

  5.  
    #3
    BMW Crazed
    Car Details
    olivercox1983's Car Details
    Model of Car:
    E46 320d M-Sport/E39 525 TDS/E39 520I SE
    Year of Manufacture:
    2003/1996/1996
    Transmission Type:
    MAN/AUTO/MAN
    Car Body Type:
    SALOON/SALOON/SALOON
    olivercox1983's Avatar
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    Location
    Surrey
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    hey, i am having the same problem with my e39 at the mo, its been laid up on the drive now for just over a week, v.annoying- i have ordered a new alternator and i am going to fit it on sat hopefully, so this may cure the problem, must voltage readings were all over the place when i checked mine.
     
     

  6.  
    #4
    BMW Guru
    Car Details
    Joe9087's Car Details
    Model of Car:
    E46 320ci M-Sport
    Year of Manufacture:
    2003
    Transmission Type:
    Manual
    Car Body Type:
    Coupe
    Joe9087's Avatar
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    Location
    Ipswich
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    I'd say it could well be the alternator. I had a similar issue with a previous car, the fans blowing slowly then quicker every now and then. It did turn out to be the alternator at fault. You may be able to get a reconditioned one or one of a car thats being broken for quite cheap. Or check out local scrapyards etc, could be worth a try before spending out much more on a brand new alternator, although if money isn't an issue I would do that for piece of mind.
     
     

  7. Alternator confirmed 
    #5
    Bimmer Fan
    Car Details
    Denson's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    2002
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

    Join Date
    Feb 2009
    Location
    UK
    Posts
    13
    Thanks
    4
    Thanked 1 Time in 1 Post
    Alternator replaced...all good.
     
     

  8. The Following User Says Thank You to Denson For This Useful Post:

    Ronnie (03-03-2009)

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