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Thread: Air Bag Light on??

  1. #51
    Join Date
    Sep 2005
    Location
    San Diego, California
    Posts
    150
    My Cars
    2004 325i, 2011 128i
    Mine came on a few years ago. I immediately took it to an independent shop who told me it was the seat belt pre-tensioner. I had it replaced for $500. A week later it was on again. I took it back to the same shop and was told "Oh, it must be the wiring harness under the seat." Another $500 later and the light is still on. I had another mechanic (whom I trust) scope it. His opinion is it's the sensor pad in the passenger seat. I haven't done the work yet, but that's the last piece of hardware that hasn't been replaced yet, so I'm banking on this being the issue. If that doesn't fix it, then f--- it, I'll remove the warning bulb (or wait until it burns out)!

  2. #52
    Join Date
    Jul 2004
    Location
    SA TX
    Posts
    1,867
    My Cars
    E46 M3
    My code reader told me specifically that it was the seat pad sensor.
    M driver, RSV4 Rider, Powerstroke roller

  3. #53
    Join Date
    Oct 2004
    Location
    San Jose, CA
    Posts
    5,132
    My Cars
    E46iT- Coma E36- RIP E34
    Quote Originally Posted by snikwad View Post
    My code reader told me specifically that it was the seat pad sensor.
    What code reader did you use?

  4. #54
    Join Date
    Jul 2004
    Location
    SA TX
    Posts
    1,867
    My Cars
    E46 M3
    I've got one of them V57 SSS NPA blah blah ones I scored from a forum member. On its own laptop and all.
    M driver, RSV4 Rider, Powerstroke roller

  5. #55
    Join Date
    Oct 2008
    Location
    Campbell, CA
    Posts
    26
    My Cars
    2000 528iT MT
    Anyone still on this thread?
    I know lots of folks have seen various combinations of this, but wondering if this looks familiar...

    My light came on after there was a water leak on the passenger side. I used the Peake tool and got the following codes:

    1A: Occupant Detector
    15: Sensor, side airbag, right data line
    03: Supply voltage
    F0: <Not sure what this is>?
    11: Seat belt buckle switch, passenger

    I tried cleaning the tensioner connectors like some have suggested, but didn't fix it. Should I be looking at a new airbag ECU module? Try cleaning the contacts again?

    Thanks!

  6. #56
    Join Date
    Apr 2009
    Location
    Vancouver Isl, BC, Canada
    Posts
    4,173
    My Cars
    98 Euro M3, 04 M3, 06 M5
    F0 is control unit fault. If the control unit was exposed to water id start by replacing it. They dont tolerate water very well. After that recheck the faults and see if any of those other ones return.
    Current:

    - 09 335i MSport, FBO.
    - 98 Euro M3, Estoril Blue
    - 04 M3, Carbon Black, 6 Speed Coupe
    - 06 M5, Black on Black, Full Leather.
    - 73 3.0CS, Tagia Green, 5 speed M30b35 converted

    Ex's: 1984 325e, 1988 325IX, 1992 525I, 1995 540i/6, 2002 330i, 2005 330xi, 1992 850i, 2003 330i #1, 2003 330i #2, 2002 330ci, 2004 330ci, 2007 328CI, 2007 335i, 2001 M3, 2006 M5 6 speed

  7. #57
    Join Date
    Oct 2008
    Location
    Campbell, CA
    Posts
    26
    My Cars
    2000 528iT MT
    OK. Good to know. Thanks for the input. I've ordered a used controller from eBay. I've heard they have to be programmed, but maybe not since it was used?

  8. #58
    Join Date
    Oct 2008
    Location
    Campbell, CA
    Posts
    26
    My Cars
    2000 528iT MT
    OK,
    I've replaced the SRS control unit (center console) with a used one. After resetting the light, it's still on, but now I get different codes from the Peake tool. First of all, I don't get a table number like the tool says I should, but the numbers I do get are:

    03
    84
    81

    Like I said, since it's not giving me a number for a table that match any in the manual, I'm not sure how to interpret these. Thoughts?

    Thanks!

  9. #59
    Join Date
    Apr 2009
    Location
    Vancouver Isl, BC, Canada
    Posts
    4,173
    My Cars
    98 Euro M3, 04 M3, 06 M5
    Quote Originally Posted by evilrho View Post
    OK,
    I've replaced the SRS control unit (center console) with a used one. After resetting the light, it's still on, but now I get different codes from the Peake tool. First of all, I don't get a table number like the tool says I should, but the numbers I do get are:

    03
    84
    81

    Like I said, since it's not giving me a number for a table that match any in the manual, I'm not sure how to interpret these. Thoughts?

    Thanks!
    The replacement module you got is MRS4, your car had MRS3. Here are the MRS4 codes... im not sure if the modules are 100% interchangeable though.

    03 is passenger belt tensioner
    81 is side airbag left sensor
    84 is side airbag right sensor
    Last edited by legoman67; 05-13-2017 at 12:48 PM.
    Current:

    - 09 335i MSport, FBO.
    - 98 Euro M3, Estoril Blue
    - 04 M3, Carbon Black, 6 Speed Coupe
    - 06 M5, Black on Black, Full Leather.
    - 73 3.0CS, Tagia Green, 5 speed M30b35 converted

    Ex's: 1984 325e, 1988 325IX, 1992 525I, 1995 540i/6, 2002 330i, 2005 330xi, 1992 850i, 2003 330i #1, 2003 330i #2, 2002 330ci, 2004 330ci, 2007 328CI, 2007 335i, 2001 M3, 2006 M5 6 speed

  10. #60
    Join Date
    Mar 2017
    Location
    Norwich, Connecticut.
    Posts
    486
    My Cars
    E46 wag. E36 convertible
    The recall may address the light-on issues too, if the BMW dealer wants to. My local dealer in New London, Connecticut, tells me to take a hike.... unless I can show them I either bought the BMW from them, and -or, that I am the first original buyer from a USA BMW dealer with a letter of recall for this car...I'm a second owner!
    Last edited by Eaglesail; 05-13-2017 at 01:10 PM.

  11. #61
    Join Date
    Oct 2008
    Location
    Campbell, CA
    Posts
    26
    My Cars
    2000 528iT MT
    That's right. The used module is from an e39, but the description is as follows:

    BMW 5 series E39 CONTROL UNIT AIRBAG SIDE MODULE Software V 3.7 ECU MRSZ4/16SB

    Does this mean my airbags will not deploy in an accident?

  12. #62
    Join Date
    Oct 2008
    Location
    Campbell, CA
    Posts
    26
    My Cars
    2000 528iT MT
    Also, as another data point, the passenger seatbelt warning light no longer comes on when a passenger is seated without the belt on. I suspect these issues are related. This was with the original srs ecu as well.

  13. #63
    Join Date
    Oct 2009
    Location
    CT
    Posts
    1,494
    My Cars
    E28, E32, E39, E53, E90
    Check the B800 scan tool out, here's the tool in action on my E39


  14. #64
    Join Date
    Mar 2015
    Location
    Athens
    Posts
    56
    My Cars
    1996 Z3 Roadster
    I know this is a well known issue, but luckily i never had this problem, except once i had to replace the small wire with the orange or yellow tip that goes onto the seatbelt trensioner, earlier today i went to pickup a friend who is BIG, like 6ft+ tall and 100kg+ heavy, once he sit on the seat, the light went on and stayed on... i will visit the dealership to reset it on monday, but until then, do you have any clue why this happened?

  15. #65
    Join Date
    Nov 2009
    Location
    USA
    Posts
    9
    My Cars
    2002 530I
    I have this problem now as well. The airbag light is on, but I think it is the seat mat sensor. Thanks for the tips guys. Will let you know what I find out.

  16. #66
    Join Date
    Jul 2017
    Location
    Usa
    Posts
    10
    My Cars
    E46 330i
    The PA Soft 1.4 software and connector from Xcar360 (https://www.xcar360.com/bmw-scanner-...de-reader.html) will allow you to determine the faulty part. I run mine on a laptop with a Windows XP virtual machine, and it works well and reliably.
    If it is the mat, the bypass is an option. There are a lot of threads discussing the bypass and possible pitfalls.


    Sent from my iPhone using Tapatalk

  17. #67
    Join Date
    Sep 2018
    Location
    Halifax, NS, Canada
    Posts
    1
    My Cars
    1997 BMW Z3
    Do you still have the bypass module for sale?
    Last edited by martinz; 09-21-2018 at 10:39 AM. Reason: spelling

  18. #68
    Join Date
    Jul 2014
    Location
    Sandwich Mass
    Posts
    2
    My Cars
    2001 BMW 325 xi Sport Wa
    After replacing seat belt receiver on the drivers side, my code gadget said not enough voltage to the airbag system. I cleaned off all the main - grounds. Still not enough voltage. I THEN CLEANED OFF ALL THE CORROSION OFF MY FUSES. THAT FIXED THE PROBLEM. MY BIMMER IS A 2001 and cleaning off the fused seem to make it run better. Also had a problem with blinking low beams. It fixed that problem also. Hope it works for you!

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