2000 E36 3G EWS mk2 alarm problem.

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  1. 2000 E36 3G EWS mk2 alarm problem. 
    #1
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    paulrobo's Car Details
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    Hi
    I have one of the last E36 compacts, year 2000 with the 3G EWS mk2 alarm. (the one with the fob with a corner missing and a red and grey button).

    The car has been off the road for a few months as i changed the passenger wing. During this time the main car battery has been changed. I cannot get the alarm to work properly.

    The fob is recognised by the alarm, and activates/ deactivates the central locking. The problem is the siren under the bonnet keeps going off.

    1. I activate the alarm by pressing the red button. The doors lock and the alarm enters the testing mode. After 30 seconds it should enter the surveillance mode and the led should flash. This isn't working as the siren will go off.

    2. If i press the grey button to deactivate the alarm, once again the central locking unlocks, but the siren will go off, and keep going off every 30 seconds. For some reason i cannot deactivate the alarm properly. After deactivating, 30 seconds later the red led flashes.
    (to stop draining the battery i have to remove the fuse from the module and unplug the siren under the bonnet)

    I have read the guide, but this seems more for programing the fob.
    Any advice please.
     
     

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    Sounds to me like a battery back up fault, be worth having a word the guy who made this thread, http://www.bimmerforums.co.uk/forum/...3g-ews-t39173/

    billywhizz1984. http://www.bimmerforums.co.uk/forum/members/20122.html
     
     

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    #3
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    Quote Originally Posted by Ronnie View Post
    Sounds to me like a battery back up fault, be worth having a word the guy who made this thread, http://www.bimmerforums.co.uk/forum/...3g-ews-t39173/

    billywhizz1984. http://www.bimmerforums.co.uk/forum/members/20122.html
    Either that, or something related to the wiring for the siren. I wonder if removing the passenger wing may have something to do with it, ie disturbing some earth connection ?

    As we speak, the alarm is deactivated, but every 30 secs, for 30 secs, the siren is going off. (until i disconnect it)
     
     

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    Ok, there is a fault somewhere triggering the warning beeps.

    On the 3G Mk2 the bonnet pin has a wire that runs from the siren loom. If you have replaced the wing this could have been cut or disconnected. Next place to check is the bootlid wiring as shown in the guide. If there is a crossed wire the alarm sensors will think there is a door open or an electrical drop and will activate the unit. Finally I have had issues in the past with faluty interior sensors. The easy way to check this is to unplug the red & white connectors from the alarm module.
     
     

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    Quote Originally Posted by billywhizz1984 View Post
    Ok, there is a fault somewhere triggering the warning beeps.

    On the 3G Mk2 the bonnet pin has a wire that runs from the siren loom. If you have replaced the wing this could have been cut or disconnected. Next place to check is the bootlid wiring as shown in the guide. If there is a crossed wire the alarm sensors will think there is a door open or an electrical drop and will activate the unit. Finally I have had issues in the past with faluty interior sensors. The easy way to check this is to unplug the red & white connectors from the alarm module.
    Thanks, I will check these out.

    When the alarm is deactivated though, surely none of this matters as the system wont be bothered about open circuits (ie if the bonnet was open, or if there was a fault in the bonnet wiring)
     
     

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    When the siren goes off on set is it a full-blast "alarm" or is is a loud beep every 2 or 3 seconds?

    If it is the full "alarm" then the system is in attack mode. Try unplugging the alarm module and reconnecting it. You may need to reprogramme it afterwards.
     
     

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    I bought a used siren off ebay, and its changed the way the alarm "operates". Now when you arm it, the doors lock, the led is solid for 30 secs, then it flashes. That seems to be working okay.

    The problem is when you disarm it, the central locking unlocks, then after 30 seconds the led comes one with one flash of the indicators. It is still armed.

    The battery back up in the siren is fine. Very loud.

    Can someone point me to a wiring diagram for the alarm please.
     
     

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    Alarm Module (Large Plug)

    1. Grey/Brown – Spliced Into Grey/Brown/Yellow of Green Plug (X13254) Pin 2
    2. Vacant
    3. Violet/Grey – To Siren Plug Pin 4
    4. Black/White – To Siren Plug Pin 3
    5. Violet/White (Shielded) – Spliced Into Violet/White in Loom behind Glovebox
    6. Brown – To Earth
    7. Vacant
    8. Vacant
    9. Brown – To LED Pin 1
    10. Grey – To LED Pin 2
    11. Blue – To LED Pin 3 & 4
    12. Vacant
    13. Vacant
    14. Vacant
    15. Red – To Live
    16. Blue/Red (Shielded) to Hazard Switch
    17. Blue/Yellow – To Purple Plug (X13253) Pin 17
    18. Blue/Green/Blue – Spliced Into Blue/Red/Yellow of Purple Plug (X13253) Pin 4
    19. Red/Brown – To Siren Plug Pin 2
    20. Blue/White (Shielded). Spliced Into Blue/White In Loom Behind Dash
    21. Vacant
    22. Brown/White (Shielded). Spliced Into Brown/White In Boot Near Light
    23. Black/Brown – Not Connected
    24. Brown/Violet. To Siren Plug Pin 5


    Alarm Module (Small Plug)

    1. Vacant
    2. Vacant
    3. Vacant
    4. Brown/Blue – Spliced Into Brown/Blue/Yellow of Green Plug (X13254) Pin 3
    5. White/Green – Not Connected
    6. White/Black – Not Connected
    7. Vacant
    8. Black – Not Connected


    Alarm Siren Plug

    1. Brown
    2. Brown/Red (
    Orange on some siren wiring)
    3. Black/White
    4. Violet/Grey
    5. Black (Black/Red or Brown/Violet on some siren wiring) This goes to the bonnet pin-switch
    6. Red


    LED

    1. Brown
    2. Grey
    3. Blue
    4. Blue – Spliced Into Pin 3

     
     

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    #9
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    Thanks.

    Any tips on where to look. I checked the bonnet pin wiring, looks okay. Changing the wings meant removing the lights, indicators etc. Any thoughts?
    Last edited by paulrobo; 14-01-2011 at 21:22.
     
     

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    First thing to try is resetting the alarm module. Unplug the alarm module and disconnect the battery, If all is well the siren should go off into attack mode. Reconnect the battery then plug the alarm module back in and it should stop but you will get the flasing LED and indicators. You may need to reprogram the fobs.
     
     

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