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X3 F25 (2011 - current)
The latest X3 brings some added style and some new features to the BMW SUV family. Talk about the new F25 now!

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  #1  
Old 11-05-2014, 07:04 PM
HAPPY_CHRISSY HAPPY_CHRISSY is offline
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Passenger Seat Belt Warning

For some reason today, I was driving and then the passenger seat belt warning came on and started chiming. There was none in the passenger seat so I clicked the seat belt in and it went off and I unlatched it and it came back on. So naturally I am getting mad b/c this is a new car, not even 1 month old and this is happening! So after 10 minutes of driving it went off. What do you think happened? The Wiring??
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  #2  
Old 11-05-2014, 09:29 PM
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Me530 Me530 is offline
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There is a weight sensor in the seat. Even a bag of groceries or a handbag will set it off. If there was nothing at all on the seat then it's possible there is a faulty sensor.
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  #3  
Old 11-05-2014, 09:40 PM
02420X3 02420X3 is offline
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RFI interference can also make the passenger seat seatbelt sensor trigger. I've never presented it to my dealer as a problem, as it can be hard to reproduce. Two mobile phones on the seat is a usual trigger, but it may take some time for it to trip. Removing both phones from being face down on the seats clears the problem. I have Sport Seats, so my resolution to the problem is that I set a 1/4" gap on the passenger seat, and put my phones in the gap.

I've also been able to trigger an alert with an iPad. I usually lay my iPad flat on the seat, but, if I get an alarm, I lean it upright against the seat back.

YMMV

Last edited by 02420X3; 11-06-2014 at 05:34 PM.
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  #4  
Old 11-06-2014, 05:05 AM
HAPPY_CHRISSY HAPPY_CHRISSY is offline
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Quote:
Originally Posted by 02420X3 View Post
RFI interference can also make the passenger seat seatbelt sensor trigger. I've never presented it to my dealer as a problem, as it can be hard to reproduce. Two mobile phones on the seat is a usual trigger, but it may take some time for it to trip. Removing both phones from being face down on the seats clears the problem. I have Sport Seats, so me resolution to the problem is that I set a 1/4" gap on the passenger seat, and put my phones in the gap.

I've also been able to trigger an alert with an iPad. I usually lay my iPad flat on the seat, but, if I get an alarm, I lean it upright against the seat back.

YMMV
I had my IPAD in the seat and my handbag. I didn't realize it was so sensitive. I will try to have it lean it up if it happens again. It is i just frustrating that these little/minor things are happening and this is my first Bimmer!
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  #5  
Old 11-06-2014, 06:36 AM
guyver626 guyver626 is offline
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My passenger seat seems to work perfectly fine. I leave my kid's diaper bag and other bags all the time and it doesn't set it off. I know these bags weigh more then a iPad. These cars are a hit or miss. My prior 2013 had stupid issues within the first month. My PDC sensor wouldn't work every once in a while, to a transmission failure. My current 14 model has been perfectly fine since day one(cross fingers). Only very minor issue on my 14 is the weather stripping on the inside of the backseat left door seems alittle cracked but it's been noted by BMW and if it gets worse they will replace it before my 4yrs are up.
Just document all the small issues and take a video and pic of the dash with the error to show to the SA if the problems continue.
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  #6  
Old 11-06-2014, 11:47 AM
Want the Thrill Want the Thrill is offline
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I routinely set things on the passenger seat and the alarm never goes off. Sounds like it is too sensitive in your case.
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  #7  
Old 11-06-2014, 02:07 PM
poker838 poker838 is offline
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for ours - two phones and a wallet will set off the seatbelt alarm
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Old 11-06-2014, 05:34 PM
02420X3 02420X3 is offline
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It's not a weight issue. It's an RFI issue. I can take something that is approximately the same size and weight as my two phones that doesn't emit RF and put them on the seat with no issues.
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Old 11-06-2014, 07:54 PM
HAPPY_CHRISSY HAPPY_CHRISSY is offline
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Quote:
Originally Posted by 02420X3 View Post
It's not a weight issue. It's an RFI issue. I can take something that is approximately the same size and weight as my two phones that doesn't emit RF and put them on the seat with no issues.
RFI issue? What does that mean?
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  #10  
Old 11-07-2014, 02:49 AM
02420X3 02420X3 is offline
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It is my belief that the cause of the false seatbelt warning is Radio Frequency Interference, high frequency electromagnetic waves emitted by electronic devices. Your iPad was on when the problem happened, right? If it is on then it is emitting RFI.
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  #11  
Old 11-07-2014, 08:30 AM
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gfeiner gfeiner is offline
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Quote:
Originally Posted by HAPPY_CHRISSY View Post
RFI issue? What does that mean?

RFI = Radio Frequency Interference
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