E39 Car Alarm goes off for no reason - BMW Forum

TheHire · 08-23-2007, 08:29 PM

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?

BMWJNKY · 08-24-2007, 06:43 PM

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.

TheHire · 08-25-2007, 03:15 AM

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.

Quote:

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.