2001 E39 540i - Airbag light sometimes comes on

Notices
 

Thread: 2001 E39 540i - Airbag light sometimes comes on

Reply to Thread
Results 1 to 5 of 5
  1. 2001 E39 540i - Airbag light sometimes comes on 
    #1
    Bimmer Fan
    Car Details
    coolluke's Car Details
    Model of Car:
    540i M-Sport
    Year of Manufacture:
    2001
    Transmission Type:
    6-speed manual
    Car Body Type:
    saloon
    coolluke's Avatar
    Join Date
    Feb 2011
    Location
    UK
    Posts
    2
    Thanks
    1
    Thanked 0 Times in 0 Posts
    Hello everyone!
    I have noticed that my airbag light sometimes comes on. It normally happens when I have a heavier passenger in the front. When my wife sits there it is fine, however when my mate sat there yesterday it came on and stayed on, but then after switching of the car for a while the light didn't come back on on the way back.

    I just bought the car and was told by the previous owner about this problem. He also said that it would only happen when a heavy person sits in the passenger seat.
    It was suggested to me that it can either be a problem with an occupation sensor or the seatbelt pre-tensioner is that right? any other ideas?
    Please help...
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    BMW Master
    Car Details
    btccfan's Car Details
    Model of Car:
    728 and 745
    Year of Manufacture:
    1996 and 2002
    Transmission Type:
    auto
    Car Body Type:
    saloon
    btccfan's Avatar
    Join Date
    Oct 2010
    Location
    worcs
    Posts
    388
    Thanks
    513
    Thanked 383 Times in 269 Posts
    Chances are it's the occupation sensor, this can be cheated with a £10 plug in emulator from ebay but the light will need re-setting afterwards.
    Having said that I thought if the airbag light came on it stayed on until it was re-set??
     
     

  4. E39 540i 2001 Airbag light sometimes comes on 
    #3
    BMW Guru
    Car Details
    lee_h's Car Details
    Model of Car:
    318 ci
    Year of Manufacture:
    2000
    Transmission Type:
    manual
    Car Body Type:
    coupe
    lee_h's Avatar
    Join Date
    Jan 2011
    Location
    middlesbrough
    Posts
    2,251
    Images
    1
    Thanks
    127
    Thanked 971 Times in 838 Posts
    Mine does the same its intermittent on mine aswel if I have a passenger and I turn right the light comes on bet when I straighten up it's fine, one if those bypass units of eBay should fix it
     
     

  5. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  6.  
    #4
    Bimmer Fan
    Car Details
    coolluke's Car Details
    Model of Car:
    540i M-Sport
    Year of Manufacture:
    2001
    Transmission Type:
    6-speed manual
    Car Body Type:
    saloon
    coolluke's Avatar
    Join Date
    Feb 2011
    Location
    UK
    Posts
    2
    Thanks
    1
    Thanked 0 Times in 0 Posts
    Ok, just read a few listings on ebay and they all seam to be talking about a situation when the light is on constantly, mine is intermittent... What about the belt tensioner idea? Does that make sense to anyone?
     
     

  7.  
    #5
    BMW Master
    Car Details
    btccfan's Car Details
    Model of Car:
    728 and 745
    Year of Manufacture:
    1996 and 2002
    Transmission Type:
    auto
    Car Body Type:
    saloon
    btccfan's Avatar
    Join Date
    Oct 2010
    Location
    worcs
    Posts
    388
    Thanks
    513
    Thanked 383 Times in 269 Posts
    When the sensor in the seat is activated it gives off (or whatever the correct term is!) a certain resistance, if the sensor is broken it will not give off the right (or any??) resistance causing the light to come on. The emulator just plugs in to the wire leading to the occupancy sensor and gives off (?) the correct resistance all the time.
    In other words the car thinks the seat is always occupied so if you have a smash the airbag will deploy even if there is no passenger which is obviously more expensive than just having to replace one airbag but safety first!!

    EDIT: besides that, if you have a shunt badly enough to deploy your airbags in a 10 year old car, chances are high that it will be an economical write off anyway!
     
     

  8. The Following User Says Thank You to btccfan For This Useful Post:

    coolluke (12-05-2011)

Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts