1993 E36 318i - 3G Alarm/Immobiliser - Will I lose the code?

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  1. 1993 E36 318i - 3G Alarm/Immobiliser - Will I lose the code? 
    #1
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    Difflock's Car Details
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    Year of Manufacture:
    1993
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    Hi All, I'm new to the site and to the BMW Fellowship.

    I recently purchased a E36 318i on a '93 plate that just needed some TLC, which it's getting by the bucket load.

    My question concerns the BMW 3G Alarm/Immobilser. I've identified the alarm system as being the 3G type after reading a excellent article on this site, contributed by member "Billywhizz1984", if I remember correctly (I forgot to Bookmark the thread).

    Anyways, as I said, I've identified the system, learned that it has a static code, and has a back-up battery in the siren. Can anybody please advise me whether;

    (1) This system will lose its code if the vehicle battery is disconnected?

    (2) What is the function of the back-up battery in the siren (i.e. is it there purely for the sounder should the vehicle battery be tampered with?)

    If it is liable to lose it's code, will I have to contact BMW to learn what the code is, as there was nothing included with the vehicle documentation regarding coding?

    Any help or advise will be gratefully received.

    Thanks.

    Will.
    Last edited by Difflock; 14-04-2011 at 23:49. Reason: Ammend members username.
     
     

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    Fixedwheelnut's Car Details
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    Edit as I put down 3T remedy Doh!

    Start again 3g can sometimes lose the code but that is usually a randomn fault not usually due to a flat battery.

    see this thread on zroadster forum on how to rest the remotes if they lose the code
    http://www.zroadster.net/forum/viewtopic.php?t=4959
     
     

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    Hi Fixedwheelnut,

    Thanks for the reply and for the link. That's one more piece of useful information to print out for the workshop manual.


    ....."Shop Local."
     
     

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    #4
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    billywhizz1984's Car Details
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    Quote Originally Posted by Fixedwheelnut View Post
    Edit as I put down 3T remedy Doh!

    Start again 3g can sometimes lose the code but that is usually a randomn fault not usually due to a flat battery.

    see this thread on zroadster forum on how to rest the remotes if they lose the code
    http://www.zroadster.net/forum/viewtopic.php?t=4959

    The above doesn't apply to the 3G mk1 so you can disregard for your system.
     
     

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    #5
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    E36 323i x 3, 325TDS x 1, 320i x 2, 318is x 1
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    Here is my guide...

    http://www.bimmerforums.co.uk/forum/...3g-ews-t39173/

    As for your questions...

    (1) Will this system will lose its code if the vehicle battery is disconnected? Not usually, however it depends on how long the battery will be disconnected for.

    (2) What is the function of the back-up battery in the siren (i.e. is it there purely for the sounder should the vehicle battery be tampered with?) The backup battery is there so that if the car battery is disconnected or the wires to the siren are cut it will run off its own batteries. The batteries are part of the alarm circuit so if they fail or don't carry charge the alarm can throw up all sorts of issues. It is all in the guide.
     
     

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