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Thread: Airbag light with INPA codes

  1. #1
    Join Date
    Sep 2012
    Location
    Nebraska
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    14
    My Cars
    2000 BMW Z3 2.8

    Airbag light with INPA codes

    Hi All!

    Iíve read all I can on the airbag light and now I need help on where to go next.
    Things Iíve done:
    Cleaned both the connectors (buckle and tensioner) with DeOxIt (which I didnít know was even a thing until I read it on the forum.)
    Moved the one of the wires that was pinched between the seat and the seat frame when somebody reassembled it once upon a time. (PO replaced seat covers) I split the out covering at the pinch point and both interior wires seemed unharmed. Could they still be damaged inside the wire covering?
    The INPA report is below. I can clear them but they come right back.
    I see that the buckle/tensioner assy is no longer available new from BMW (please correct me if Iím wrong) and Iím worried that a used/eBay replacement might have the same problem. Can I unplug them and check voltage or continuity on the car side? What should I look for? Then I could at least narrow it down. I read that you shouldnít electrical check the explosive charge wire but is there anything else I can do? Can I check the buckle electrically?
    Any help is much appreciated! Thanks all!




    47B51212-EF4F-4529-A300-8614ED43A08C.jpg

  2. #2
    Join Date
    Oct 2003
    Location
    Seattle
    Posts
    2,344
    My Cars
    99 M3
    Have you used the last seven of you VIN in www.realoem.com to determine you exact p/n requirements, as some of the receptacle p/nís are still available.


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Sep 2012
    Location
    Nebraska
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    2000 BMW Z3 2.8
    I checked again and found some interesting things.
    Real OEM shows 72118221013 as the driver (left) tensioner.
    It also shows that number being superseded by 72118413887.

    ECS doesn’t even recognize the first number and the second number is NLA. (This is what I remember)

    BUT....bmwdirectparts.com (huskerparts) shows both of them available, strangely it doesn’t show any use info on the first number, but it does say that the second one does NOT fit my car, it’s only for the ‘99 coupes and the 2000-2002 M’s.

    Anybody else have any ideas before I drop 100 bones on a new one? I did notice that it doesn’t come with the connector for the explosive unit so I may still have an issue if I use the old wire.

  4. #4
    Join Date
    Oct 2013
    Location
    Augusta, GA
    Posts
    352
    My Cars
    1999 Z3 M-Roadster, 2007
    Was the airbag light on when you got the car from the previous owner? Do the wires that were pinched lead to the tensioner? If answers are yes to these questions, Iíd suspect the pinched wires are broken. In any case it would be good to find the ends of those wires and any that run to the tensioner and check for continuity before spending big bucks for parts you may not need.

  5. #5
    Join Date
    Sep 2012
    Location
    Nebraska
    Posts
    14
    My Cars
    2000 BMW Z3 2.8
    Yes, its been on the whole time. The pinched wire was the one with 2 leads, which I think is the one for the buckle. The other one has 4 wires for the tensioner.

  6. #6
    Join Date
    Sep 2012
    Location
    Nebraska
    Posts
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    My Cars
    2000 BMW Z3 2.8
    Just an update for future searches: I replaced the tensioner with a new 72118221013. I reset the codes in INPA and the airbag light went off. Then after 5 minutes it went on again. Unplugged and replugged the wires, reset codes, light is off. Then drove for 10 minutes and the light is on again. Resistor too large. Reset codes again, and hasn’t been on for the last 3 ~10mi trips so i’ve got my fingers crossed that it stays off. I think I will replace the connectors with my own connectors if it does it again.

  7. #7
    Join Date
    Sep 2018
    Location
    Houston, TX, USA
    Posts
    59
    My Cars
    1999 BMW Z3 Coupe 2.8
    Quote Originally Posted by sydjai View Post
    Just an update for future searches: I replaced the tensioner with a new 72118221013. I reset the codes in INPA and the airbag light went off. Then after 5 minutes it went on again. Unplugged and replugged the wires, reset codes, light is off. Then drove for 10 minutes and the light is on again. Resistor too large. Reset codes again, and hasn’t been on for the last 3 ~10mi trips so i’ve got my fingers crossed that it stays off. I think I will replace the connectors with my own connectors if it does it again.
    Thanks sydjai, I'd have to check to be sure but I think I have the same error code on my car. I'll probably have to replace mine as well.

    Light still of?

  8. #8
    Join Date
    Sep 2012
    Location
    Nebraska
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    My Cars
    2000 BMW Z3 2.8

    Thumbs up

    Yep it's still off!! Been using it as my DD all this week, knock on wood!

  9. #9
    Join Date
    Sep 2018
    Location
    Houston, TX, USA
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    59
    My Cars
    1999 BMW Z3 Coupe 2.8
    Quote Originally Posted by sydjai View Post
    Yep it's still off!! Been using it as my DD all this week, knock on wood!
    Sweet!

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