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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 08-23-2007, 08:29 PM   #1 (permalink)
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Exclamation E39 Car Alarm goes off for no reason

My car alarm (Factory fitted) goes off for no reason (2003 530i). It has become more frequent with the heat. It only started at the beginning of the summer. I never had that issue in the winter.

Any help?
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Old 08-24-2007, 06:43 PM   #2 (permalink)
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Take a look at the square in the middle of your headliner. This is part of the interior sensor for the alarm, its about 4"x4" and the same color as the headliner. If the square is "solid" looking, as in no plastic grille with slats in it you need to get an updated interior sensor. The early interior sensors have a known issue with setting off the alarm for no real reason.
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Old 08-25-2007, 03:15 AM   #3 (permalink)
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Thanks for the tip. I will check it our tomorrow. As far as I remember, I think I have the grille looking (with slots) motion sensor.

Somebody suggested me to check out the alarm switch under the hood.

I will look into that as well.

Thanks again.

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Originally Posted by BMWJNKY
Take a look at the square in the middle of your headliner. This is part of the interior sensor for the alarm, its about 4"x4" and the same color as the headliner. If the square is "solid" looking, as in no plastic grille with slats in it you need to get an updated interior sensor. The early interior sensors have a known issue with setting off the alarm for no real reason.
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