2002 E39 520es central locking/electric power loss issues

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  1. 2002 E39 520es central locking/electric power loss issues 
    #1
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    wdale12000's Car Details
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    Hi, In the last 4 or 5 weeks I,ve had problems (has happened 7 or 8 times) with central locking playing "silly buggers" and also when inserting key into ignition and turning to ignition position there is no electric power showing to either ignition circuits or battery fed circuits (total power loss?) Each time it has happened I,ve been trying to access the car, and either the central locking won,t open or it has opened itself before I,ve got to the car, and a couple of times as described earlier when turning ignition on there is no electric power. Each time one of these "gliches" has happened I,ve got it corrected and engine started quite quickly by re-inserting key or playing around with doors,etc. I wondered if it could be a key to car comms problem or battery problem but it happens also with my spare key, and battery seems to check out ok (green indicator on and reading 12.4V with voltmeter) I,m worried that I lose electric power when driving but since that has not happened, I was thinking it,s maybe that it,s only a central locking/immobiliser/accessing the car problem. Sorry about the long winded explanation but I hope somebody can shed light on this.
    p.s. I am a factory maintenance electrician but modern car electrics, modules et al confuse me big style !!
     
     

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    #2
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    mikesmith2's Car Details
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    I think the best option is to get the codes read.

    There could be a number of reasons why this is happening.

    Some wheel sensors can cause some very odd behaviuor, or it could be a locking module, or as you say the immobiliser.
     
     

  4. Locking Problem 
    #3
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    Sycane's Car Details
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    I had a similar problem this morning in that when I got to work, unlocked the car (with the key), went to lock the car and nothing... tried many more times and finally decided to use the locking button on the centre console, nothing...

    I started up the engine, tried the locks with still no response. Turned off the car and opened the boot lid and rear door -all other electrics seem to be working just fine.

    I resulted to locking the doors internally one at a time with the plungers and as I walked away tried the key again -it worked.

    A few days ago I had a message on the dash saying to check the low beam lights and I could see in a reflection that the near side was out. At the time I turned the Auto lights off and back on again and the 'bad' light came on again.

    I can see there must be an issue somewhere, possibly corrosion of an electrical circuit somewhere. I haven't yet looked a fuses or anything else since the electrics 'seem to recover'.

    Anyone have any ideas where to start? -thanks in advance!
     
     

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    #4
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    Ronnie's Car Details
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    Have you consider changing/checking the bulb Sycane?

    Also for the fault with the central locking a diagnostic scan at a BMW independent specialists should bring up a fault code or 2

    It sounds slightly like the General Body Control Module, but E39 items aren't as common as far as I know, unlike the e46 items
     
     

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    The GM is linked to the alarm system Ronnie
     
     

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    #6
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    Chauffeurs 4 you's Car Details
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    Hi
    The e39 suffers from the main ignition block (the electric bit that bolts onto the back of the ignition barrel) BMW even keep them in stock as they sell so many!! This tends to cause all sorts of electrical problems, one of the usual symptons are the vanity mirror lights dont work.
     
     

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