Question about 2002 BMW 5 Series

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Car alarm goes off for no reason. - 2002 BMW 5 Series

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  • Anonymous Aug 15, 2008

    Car alarm goes off for no reason.

  • bmw525i Sep 04, 2008

    Same problem with my 2003 525i. the alarm goes off all the time since after 50K miles.

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1 Answer

Common fault is the bonnet sensor, when this happens to me I open the bonnet press the sensor plunger a few times, it fixes it for a while. Get this checked or replaced .

Posted on Sep 18, 2008

6 Suggested Answers

  • 1 Answer

SOURCE: Alarm sounding for no reason

Gave battery a good charge and a good run out. Will see if this works for any length of time.

Posted on Jun 15, 2009

  • 630 Answers

SOURCE: Alarm goes off for no reason

If you can turn off the internal ultrasonic sensors (many cars allow this so that pets can be left in a car) it may solve the problem. If you can't winding a window down a little sometimes will help

Posted on Oct 03, 2009

  • 743 Answers

SOURCE: car alarm goes off for no reason

There is probably a reason...I would look for bad grounds. A good place to look is at the battery terminal. Clean them and if the problem still exist, I would have an experienced tech look at the unit itself.

Posted on Oct 05, 2009

  • 1 Answer

SOURCE: my car alarm goes off for no reason

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

  • 1 Answer

SOURCE: 1999 car alarm goes off when the car is locked.

Not a solution, but details about the same problem with my car: I have a 99 Lincoln Continental and have noticed correlations between certain conditions and the frequency of the car alarm going off.

When it is hotter outside, the alarm goes off more frequently than when it is colder.

The more of a slant the car is parked on, the more often the alarm goes off. My boyfriend's driveway is on an incline and any time I park my car there, the alarm will go off every 30 seconds. If I move the car to the level street, it doesn't go off at all. This has been noticed on other slanted places I've attempted to park as well.

Posted on Nov 12, 2009

  • 173 Answers

SOURCE: car unlocked but it sets

Are you using the the keychain to lock unlock the vehicle? A low battery in the keychain will send wacky codes to your vehicle alarm system and will not set properly. Try using the key in the door to lock unlock vehicle. IF the alrm does not go off when using the key in the door, then you probably have to change the battery in the key chain. Best guess without being there to look at vheicle.

Posted on Feb 03, 2011

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Not a solution, but details about the same problem with my car: I have a 99 Lincoln Continental and have noticed correlations between certain conditions and the frequency of the car alarm going off.

When it is hotter outside, the alarm goes off more frequently than when it is colder.

The more of a slant the car is parked on, the more often the alarm goes off. My boyfriend's driveway is on an incline and any time I park my car there, the alarm will go off every 30 seconds. If I move the car to the level street, it doesn't go off at all. This has been noticed on other slanted places I've attempted to park as well.

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