Question about 1999 BMW Z3

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My car alarm goes off for no reason

My car alarm seems to go off for no reason, any ideas? its happened four times in the last week

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  • joe May 11, 2010

    have you tried disabling either the hood switch or trunk switch and leave it that way for a few days to see if one of these switches is causing the problem? each should have a disconnect that you can unplug.



    easiest one should be the hood switch. look for the little plunger where it meets the hood, then follow the wire to the connector. if after a few days the alarm goes off, reconnect the hood switch and disconnect the trunk switch.

  • Rob
    Rob May 11, 2010

    Is this a factory anti-theft alarm, or installed sometime afterward?



    Have any of yuor neighbors recently installed any sort of high-powered radio equipment recently?

    (CB's, amatuer radio, etc?)

  • Nicole Crocker
    Nicole Crocker Nov 07, 2013

    Installed afterwards, the car was a gift

  • Nicole Crocker
    Nicole Crocker Nov 07, 2013

    No but I will try this

  • Nicole Crocker
    Nicole Crocker Nov 07, 2013

    Thanks for your help

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I have the same problem with my Z3 alarm going off, a local BMW specialist has traced it to the pitch sensor which has been damaged due to a water leak, the wires are also corroded. They have quoted £200 to fix it, but advise that the water leak is sealed first because it'll just get damaged again. I've had a look round and it appears the water is getting in by the off side light cluster via the boot gutter.

Posted on Oct 26, 2009

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My remote control don't turn off the alarm, lock or unlock my z3,(yes i have changed the batteries)

Posted on Aug 21, 2010

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Have a look in the boot for water, apparently the alarm Pitch Sensor can get damaged.Bmw priced this part at £278.71 and another £300+ to find where the water is getting in.

Posted on Jul 18, 2009

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Check driver door module

Posted on Mar 07, 2009

2 Suggested Answers

SOURCE: My 2003 X5 alarm started

Try a new hood switch,the newer type is longer and prevents false alarms.

Posted on Aug 22, 2008

  • 10 Answers

SOURCE: bmw alarm keeps going off

Had the same problem. I cleaned the bonnet open/close sensor located at the back left of the engine compartment, and sprayed it with wd40. Worked a treat for me. Another solution is to push you lock button twice. This turns off the interior movement sensor.

Posted on Jul 22, 2010

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