Question about Audi A4

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Audi 98 A4 alarm went off and would not shut off, when it did the ignition was locked out, and you could not get a key inside. Now you can get key inside ignition, but car will not start, just clicks once when you turn key. Had AAA out and it isnt batterie, he seems to think the car is on some kind of anti theft lockout......HELP!

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  • royal_flushp Jul 22, 2009

    no What is the driverside pillar?? I am a plumber and no nothing about cars...the day was very hot out when the alarm went apeshit on my wife.....If you could describe where it is I wil accept your answer.....also I had AAA out and he had a charger on my batterie and said it was fine, this is the first thing that i thought of and went out and got a new one right away..


    thanks

    TIm


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  • Contributor
  • 37 Answers

Audis and Volkswagen beyond 97 have microcontacts in all door locks and the trunk lock. They tend to fail and the anti-theft recognizes it as attempt to mess with the car. So it triggers the alarm. Sometimes also all windows come down nighttime on their own or the alrm triggers without any obvious reasons. First thing are always to the the microswitches. If its a wagon, water in the trunk lid can be the reason (thats where the micro switch for the trunk sits)

Posted on Aug 16, 2009

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  • Audi Master
  • 2,359 Answers

The factory alarm system has a motion detector. In a HOT near triple digit day,it can cause false trigger/reading to the sensor,

Some Audi A4 has a disable switch on the driver side A pillar. You may able to disable it.

Make sure the battery is charged up and try again,


Battery has a CCA (cold cranking amp) rating on the side sticker,

If the tester read 60% below the stated CCA then it should be changed.


A battery is rated for 24,48,84 month.

When is the last time battery change?


Posted on Jul 17, 2009

  • 1 more comment 
  • Vincent_G
    Vincent_G Jul 20, 2009

    Are you able to locate the motion sensor disable switch on the driver side pillar?




  • Vincent_G
    Vincent_G Jul 23, 2009

    The ultrasonic sensor disable button should on the driver side windshield post. Car guy call it A pillar.

    Check the owner manual on the exact location.


    A high quality can take 3-4 heavy discharge.

    Example: leaving the headlight on for 2-3 hours.......


    Getting a new battery is a good move.




  • Vincent_G
    Vincent_G Jul 25, 2009

    Are you able to locate the switch that can disable the motion detector in the A4?

    ==

    I hope you got the problem under control.

    ==

    If the alarm keep going off again then I would place close attention on disable or replace the motion sensor.





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