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Alarm keeps going off!?

Discussion in 'A4/S4 forum(B5 Chassis)' started by tara_nta, Nov 14, 2011.

  1. tara_nta
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    tara_nta Member

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    A4 1.9 tdi 1999
    Since I've had the car (3 weeks) whenever I lock the car wether I do it by the button or by the key the alarm doesn't shut up! It doesn't go off straight away, for example last night I got home at 10pm, locked the car by the button. By midnight it was going off!

    I had noticed the wires that go to the squishy bonnet sensor thingy lol (please excuse my fantastic descriptions) had come off, so I put new connectors on the ends of those wires and plugged them back in. Still no difference. I haven't got anything loose or hanging inside the car.

    Any ideas guys?
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  2. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Vagcom scan to find out whats triggering it.

    It could be a failing siren.
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  3. tara_nta
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    tara_nta Member

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    My friend has got a diagnosticp machine from snap on, wil that scan it? If not how much is vagcom and where to get it? Thanks very much
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  4. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    No idea if the snapon tool will connect to the appropriate controller.

    You can buy a vagcom cable off ebay for a tenner and use the free-ware version of the software to get you started.
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  5. tara_nta
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    tara_nta Member

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    Ah lovely, dont suppose you have a link for a the right one?
    Thanks for your help mate
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  6. tara_nta
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    tara_nta Member

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    Right, got hold of a vagcom lead and software. Ive plugged it in and scanned the car and its showing fault - alarm triggered terminal 15.
    What and where is terminal 15? Bonnet sensor? Door sensor?
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  7. Arrkon
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    Arrkon Midlands regional Moderator Regional Rep

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    T15 is the ignition feed IIRC... could have a duff ignition switch. if the alarm is armed and it detects a "key on" event, the alarm will trigger.
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  8. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    You'll really need to clear the codes, and wait for the alarm to trigger again.

    That T15 code could be ancient.
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  9. tara_nta
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    tara_nta Member

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    Codes have been cleared, alarm has triggered again and its brought up interior monitoring sensor this time. Apparently according to an Audi specialist there is a sensor in the headlining. Remove interior light to reveal it? That sound right?
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  10. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Nope, interior monitoring is in the tops of the B pillars, two ultrasonic things each side.

    If you press the button on the B pillar when you get out, it should disable the interior monitoring. If that doesnt work its presumably a fault with the interior monitoring control box, rather than the sensors.
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  11. tara_nta
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    tara_nta Member

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    Yep, still goes off if i press the button on the b pillar. Where is the monitering box located?
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  12. CraigG
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    CraigG Member

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    under the rear seat, right in the middle, red plug iirc.

    I guess you could try just completely unplugging that control box and see what happens?
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  13. tara_nta
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    tara_nta Member

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    Craig. . . . . Thankyou, i wil investigate! Fingers crossed i can simply unplug it and leave it at that.
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  14. tara_nta
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    tara_nta Member

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    Thanks for your help fellas. . . . . I unplugged the monitering box and the alarm has kept itself quiet!
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  15. jcb
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    jcb Active Member

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    my money is on the alarm siren battery.
    it drops dead around the 10 year mark and fritzes everything

    I had all those codes and it was the battery unit causing it
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