2004 E60 525d “Restraint System Failure” message

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  1. 2004 E60 525d “Restraint System Failure” message 
    #1
    Don
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    Model of Car:
    525d
    Year of Manufacture:
    2004
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    After kneeling with most of my weight on one knee on the Drivers front seat while leaning over to retrieve some rubbish from the passenger side foot well, I think I may have broken the drivers seat occupancy sensor.

    I now get “Restraint System Failure” message and both the Airbag failure and Occupancy failure lamps are lit on the consol display.

    Can anybody confirm that it is likely that I have broken this sensor, and if replacement of this sensor is suitable for DIY or for main dealer only?

    Thanks,

    Don
     
     

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    #2
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    If you knee was putting pressure at a certain point on the seat, then yes it does sound like a broken sensor . It is a complex and expensive to replace, so you may want to look into fitting an occupancy simulator circuit if you still want the air bags to work.
     
     

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    #3
    Don
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    Thanks NealP

    I’m sitting down now, just how expensive are we talking £100 - £200 or more?

    I’ve seen other posts on the occupancy simulator, are they safe legal?

    Cheers,

    Don
     
     

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    You are talking around £85 for a replacement mat, but the work lies in fitting it to the seat as they are buried. Occupancy simulators are just that, simulate a passenger. Only downside is that the passenger air bag will activate regardless in an accident.
     
     

  7. The Following User Says Thank You to xXNealXx For This Useful Post:

    Don (12-01-2010)

  8. Low Battery Can Disable the restraint system & Airbags??? 
    #5
    Don
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    Can anyone verify or otherwise let me know if a low battery can disable the Restraint system & Airbags?

    Took my car to the dealer, as usual the dealer reads the fault codes and discovers that there is indeed a problem with the Restraint system & Airbags. Dealer also notices that the car battery is in a low state of charge. So according to the dealer the Restraint system aka the Airbag system turns its self off if the battery is in a low state of charge???

    Anyway the dealer resets the fault codes and gives the batter a quick charge and the warning lights have gone. The car has been used for a week now and the faults have not retuned???

    I challenge the dealer over the low battery and pointed out that this was a new battery fitted by the same dealer only 4 months ago. I also mention that there had been no consol warning messages indicating a low battery state or charge condition reported to the consol as before when they said a new battery was required. And as far as having the battery in a proper state of charge, the car had been in use most days and had covered 300 mile just the day before the airbag warning message, plenty of time to charge the batter properly???

    Anyway the long and the short of it is that after resetting the codes and charging the battery the fault has gone.

    Still none the wiser......

    Don
     
     

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    There is an intelligent batter sensor attached to the battery if this is the case. Did your dealer explain about this to you?
     
     

  10.  
    #7
    Don
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    Yes, the IBS was at the heart of some problems I posted on this site before http://www.bimmerforums.co.uk/forum/...ocation-t20863

    Back when I did have a faulty battery the IBS did its job by sending me warning messages “Low bat voltage” etc , and it shut down the air con, the heated seats, the rear demister, heated mirrors etc. But this time round nothing, I go no warnings at all, and its a new battery to boot.

    It just seems a tad unbelievable that the dealer says its programmed to disable the Restraint system and airbag system if you have a low battery. I had no warning messages from the IBS no other symptoms, and had travelled a full 300 mile trip the day before the airbag laps came on.

    I’m wondering if there is some literature out there that actually says this is how car should behave, really the concept of needing a good battery voltage before the protection top the occupiers of the car from the airbag system seems a bit strange.
     
     

  11.  
    #8
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    henrys dad's Car Details
    Model of Car:
    E61 525D
    Year of Manufacture:
    2005
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    Don, have the same message on my 2005 E61 and was wondering if you ever got this sorted?

    Thanks in advance

    Chris
     
     

  12.  
    #9
    Don
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    Yes, got the dealer to check out, but all they did was reset the fault codes, fault has not occured since
     
     

  13. Drivers seat 
    #10
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    Im pretty sure the drivers seat does not have a sensor. I am having the problem with the restraint/airbag warning light permanently on. The passengers side airbag warning is a common BMW fault, my 330dMsport had it and now my 535d Msport.
    I fixed the 330d with a bypass.
     
     

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