1999 E36 328 3G EWS Alarm Problem - Page 2

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    #11
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    paulrobo's Car Details
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    Its the siren with the internal battery back up. Is there a switch.

    Its the EWS 3G mk2.

    If you change the main car battery, is there a procedure for reconnecting it. ie should you have the ignition on or off, or shouldnt it matter. The problem is not the fob recognising the alarm, its the alarm seems to be out of sync. All since i replaced the main car battery.
     
     

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    #12
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    billywhizz1984's Car Details
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    No, there isn't . Try reprogramming the fob to the module as described in the guide.
     
     

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    #13
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    Quote Originally Posted by billywhizz1984 View Post
    No, there isn't . Try reprogramming the fob to the module as described in the guide.
    Tried that. The fob works in that i can open and close the car central locking with it, and it enables and disables the alarm. Its the siren that keeps going off. The only thing i can do is disconnect it at the siren. It still go's off, but only once, then stops. If i left it connected, it would never stop, alarm armed or disarmed.

    I understand there is a sensor inside the alarm, maybe thats where the fault is. It doesn't seem to ever get the right feedback and shut up. Does the siren have an earth?

    (all since i changed the main car battery)
     
     

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    #14
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    billywhizz1984's Car Details
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    Usually when you get this kind of issue after swapping the battery it is down to failure of the backup battery in the siren. Later sirens are sealed in resin so all you can do is replace it. You could also try unplugging the module, disconnecting the battery, then reconnecting the battery and the module. That should reset the module.

    The fact it activates when disarmed also indicates an internal fault. When you disconnect the siren it cuts off the main battery power and it falls back on the internal backup battery power (which by now is almost nil) and that is why it sounds briefly before fading away.
     
     

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