1997 Z3 2.8i - Key fob reprogramming. 3G alarm. HELP!

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  1. 1997 Z3 2.8i - Key fob reprogramming. 3G alarm. HELP! 
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    My 1997 Z3 2.8 is rarely used - just 8,000 miles since I bought it new almost 14 years ago.
    I've recently recharged the battery and started it for the first time in about 8 months.

    The 3G alarm is now permanently armed and neither of the key fobs will turn it off or operate the central locking, although the central locking still works off the key. I've fitted new batteries to both key fobs (the two button type with the cut off corner), but it seems that the control module no longer recognises them. Luckiy I still have the little key to turn off the siren but the alarm still operates the flashers.

    I've studied the Billywhiz post about reprogramming the key fobs, and I've found the control module behind the glove box.

    The problem is that I can't reprogram the key fobs while the alarm is activated. I've tried removing the receiver part of the module and shorting out the pins, but it hasn't worked -the alarm is still activated. My understanding is that the reprogamming procedure won't work unless the alarm is disarmed, so I'm stuck.

    Can anybody help?
     
     

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    Switch the siren on then try removing the receiver and disconnecting, then reconnecting the battery.
     
     

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    Quote Originally Posted by billywhizz1984 View Post
    Switch the siren on then try removing the receiver and disconnecting, then reconnecting the battery.
    Hi Billywhiz
    I'm confused! I can remove the receiver but what should I then disconnect?
    Will this achieve anything if the battery is disconnected at the time? And what should I do next after reconnecting the battery?
     
     

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    Quote Originally Posted by billywhizz1984 View Post
    Switch the siren on then try removing the receiver and disconnecting, then reconnecting the battery.
    I've just read your reply again and I think you probably mean unplug the receiver, then disconnect the battery and reconnect it again. I'll try that tomorrow but I'm not optimistic because I've been disconnecting and reconnecting the battery all day simply to stop the alarm.

    Incidentally, I've read elsewhere that it isn't necessary to have the siren switched on in order to reprogram the remotes.

    I've almost reached the stage where I give up and take it to the dealer, but I'll try a few more things first. I'm a bit worried that because my car has been standing for so long there may be corrosion inside the module and I suspect that a replacement will be expensive.

    Thanks for your informative post and your perseverence, by the way.
     
     

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    Shorting all pins is the usual reset but you've tried that. When voltage is reapplied we need the module to reset so trying this without the receiver is the first step. If that fails you should try disconnecting /reconnecting the battery with the entire alarm module disconnected. Once you've tried the free stuff I'm afraid it is a dealer or Sigma alarm specialist job.
     
     

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    Problem solved!!!! YIPPEEEEEE !!!!

    I've finally done it. I tried again shorting out the 8 pins joining the receiver part of the module to the main body of the module, and this time it worked - it disarmed the alarm. Having done that I flicked the switch in the receiver, replaced it on the module, pressed the red buttons on both remotes, then flicked the switch back again. I now have two fully working remotes!

    I don't know which pins I shorted out because I tried every possible combination including joining them all together, but I can confirm that it didn't do any damage. I can also confirm the following:-

    (1) The alarm system definitely needs to be disarmed before the remotes can be reprogrammed. If the problem was caused by the car battery going flat through storage, as in my case, then it is very likely that the system has armed itself in the same way as it does if the battery is disconnected or the wires are cut.

    (2) The siren can be switched off under the bonnet if you have the correct key. This does NOT affect the reprogramming procedure.

    (3) It is not necessary to disconnect the whole alarm module. In order to disarm the system you only need to prise off the receiver part. This also makes it easier to see the little programming switch underneath the rubber blanking plug. You need to replace the receiver part before pressing the red buttons on the remotes, of course.

    (4) The doors, bonnet and boot need to be closed during the disarming and reprogramming. If the vehicle is a Z3, it helps to be contortionist.

    Thanks again to the original posters of the procedure. I suspect that this is a very common problem.
     
     

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