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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-23-2013, 03:01 PM
okii okii is offline
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Location: northern CA
 
Join Date: Sep 2005
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Mein Auto: 530i
passenger restraint (seatbelt) warning in hot weather

I have a 2010 e90. After the car has been parked in the sun, when I start it up I receive a passenger restraint warning symbol on the dash for the front passenger belt. But there is no one in that seat and there is nothing on the seat. It seems to only happen when the car has been parked in a sunny location. I live in the SF Bay Area so we're not talking extremely hot temps, even with the windows closed. And if so, why/should that trigger this false warning? What could be causing it to give this warning?

Thanks.
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  #2  
Old 05-23-2013, 03:44 PM
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BiHoTTo115 BiHoTTo115 is offline
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Mein Auto: 2006 330xi
Passenger seat mat error, it'll go haywire sometimes. 330's had the recall (before a certain production date; at least before 02/06 which is my date unfortunately), but not sure about 530's. I had mine go ape-**** one time (and only one time), and I just turned the car off, and on again. I also bitch slapped the seat, so maybe that helped too.
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Old 05-23-2013, 04:09 PM
SlickAsCanBe SlickAsCanBe is offline
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Location: CA
 
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Mein Auto: 2008 BMW 335i
Quote:
Originally Posted by okii View Post
I have a 2010 e90. After the car has been parked in the sun, when I start it up I receive a passenger restraint warning symbol on the dash for the front passenger belt. But there is no one in that seat and there is nothing on the seat. It seems to only happen when the car has been parked in a sunny location. I live in the SF Bay Area so we're not talking extremely hot temps, even with the windows closed. And if so, why/should that trigger this false warning? What could be causing it to give this warning?

Thanks.
I also had this same problem in the Bay Area. I had the sensor replaced by the dealer a couple months ago and things were going OK up until a couple weeks ago when the weather started picking up in heat again and the sensor starting going off again. Unfortunately, we're probably going to have to swing by the dealer again. Not a big deal to me since I'm still under CPO, if you are still under, I'd just bring it by again.
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Old 05-28-2013, 02:45 PM
iaebg iaebg is offline
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Location: Boston
 
Join Date: Apr 2013
Posts: 72
Mein Auto: 328i xDrive Coupe
passenger restraint (seatbelt) warning in hot weather

I had this happen a couple of times in warm weather as well. Shut the car off for a minute and it goes away. I'm going to mention it at my next service. Anyone know if this will store a code?


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Old 06-25-2014, 11:07 AM
airmarc airmarc is offline
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Location: Fort Lauderdale, FL
 
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Posts: 55
Mein Auto: Z4 sdrive30i
Happened to me yesterday! I dont normally leave my car in the sun all day but did and this happened. I pulled over and restarted the car and it went away. How is it that temperature plays a role in its function (or malfunction) of the sensor
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Old 06-25-2014, 11:16 AM
fdriller9 fdriller9 is offline
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Mein Auto: '06 AW 330xi
It's not just 3 series. It was early build models with sport seats

The issue is that the resistive wires in the seat sensor break and cause a change in resistance. The MRS module wants to see resistance within a certain range and when the wires break, the values fall out of this range.

Kneeling on the seat exacerbates this problem.

With heat, the mat and or seat may expand and cause the wires to loose contact momentarily. When the seat shrinks back as temps go down or the mat is manipulated a certain way, the error will go away.

You can have the OC3 passenger seat mat sensor coded off. However, the passenger air bags will deploy regardless if there is an occupant or not. If the car is not claimed as a total loss, repairs will increases due to the dash having to be replaced as well as the airbags.
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Last edited by fdriller9; 06-25-2014 at 11:19 AM.
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