2004 645i-All warning lights displayed-(FIXED)

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  1. 2004 645i-All warning lights displayed-(FIXED) 
    #1
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    bobst's Car Details
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    During heavy rain on motorway the ABS warning light came on followed after a few minutes by all the warning lights and the speedo reading zero, the car then cut out. On the hard shoulder attempting to start the car gave no response.
    Started by recovery agent who thought there may be a charging problem.

    BMW suggested cheking to see if any water had gathered in the boot well but this was dry.


    Drove to destination at 60mph in inside lane, still raining.
    Two days later drove 250 mile home, in dry, at normal speed with no problem.

    On return BMW diagnostis said there could be a wiring connector problem or the alternator could need replacement.


    Some three weeks later the fault is now intermittently returning after driving short distances.
    When the warning lights are on the active steering does immobilise.

    Anyone had the same problem.
     
     

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    Does sound like a charge problem, the warning lights will be one of the first to come on as their parent ECU's detect less than true 12 volts and flash up a fault code relating to voltage low.

    If I were you I would buy a multimeter(can be got cheap) and the next time it does it put the meter on the battery and check the charge rate at the battery and IF you could get to it the charge at the rear of the alternator
     
     

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    bobst (01-01-2009)

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    #3
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    Thanks for the response.

    With the car parked, engine running and all the warning lights on the meter is fluctuating around the 13.85 vdc mark across the battery.

    Is this an acceptable level.
     
     

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    I should have added that with the ignition turned off the reading across the battery is 11.8 vdc.
     
     

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    11.8 is low for a fully charged battery, should be around 12.8 volts.

    Engine running the reading should be around 13.6 - 14.7 generally

    Would be worth getting the battery tested
     
     

  9. 645ci Electrical probs too 
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    I too am having similar problems with my 2004 645. About every 6-8 weeks I get an error from the idrive, telling me there is an issue with "driving stability". Then the indicators will not self cancel, and the windows can operate very slowly. Sometimes, I then get a series of other serious faults eg. transmission failure, power steering failure, brake failure etc. until the car grinds to a halt.

    Once left for a couple of hours, the system reboots itself and everything is fine for another 6-8 weeks. It has been into the dealer twice, but the car has rebooted and cleaned out all history of the faults, and therefore the diagnostics say there is nothing wrong.

    I have a couple of months left on the warranty and am desperate to get BMW to resolve it before I have to fork out to fix it. Any help would be very gratefully received!
     
     

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    not direct help, but I'd have thought if the problem has been identified during the warranty period, and they don't manage to rectify before the end of the period, then they would still be obliged to sort it under warranty?
    320d ES fur die wochen
    H22 Powered EG civic - 210bhp, 925kg, fuuullly stripped.
    4.0 High Output Jeep Cherokee for playing...200bhp, 1400kg..faster than the bimmer

    well I *was* bmw driving champion lol. 4 months! best I start again...
     
     

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    I can't help but think a ECU must have some control on the charge rate and is not powering the alternator up like it should. I know there are other cars that the ECU controls the charge rate, maybe a DME update is inline? clutching at straws
     
     

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    #9
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    My car is at a good BMW dealer as we speak.

    The initial report is that the component which is attached to the negative battery terminal has recorded 22 faults during the last few weeks.

    This components controls the charge from the alternator and tells it when to supply the battery. Their feeling is that this is causing the problem.

    I will give more detail after I have collected the car tommorrow.

    My low battery voltage, reported earlier, may have been due to the car doing almost zero mileage for the last two weeks. I checked after todays 20 mile drive to the dealers and it read 12.4 vdc.
     
     

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    Ronnie (06-01-2009)

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    Thank you for the great update, very good info will keep fingers crossed for you and look forward to hearing what the outcome is
     
     

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