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Thread: Unable to get info from SRS module

  1. #1
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    850iA - 1990

    Unable to get info from SRS module

    Hi.

    Yesterday, after some minor changes replacing a bulb at the instrument cluster, the Airbag light started flashing.. I tried to get the error code and/or erase the error message using the DIS... but no luck... as the SRS/airbag module refused to communicate with the DIS ( other modules worked.. ).

    I have checked all the wires coming to the airbag and everything seems to be ok, but SRS module still refusing to be reached by DIS...

    All fuses are ok, and looking at the ETM i am not able to get any clue about what can be happening...

    Any advise ?

    Thanks in advance.

  2. #2
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    91 850i +++
    How come the middle half of any project always takes the most time?

  3. #3
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    I haven´t the diagnosis part of the docs for E31, only the diagrams. Just reading.

    Will update.

    Thanks Max !!

  4. #4
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    Hi.

    No luck with manuals, neither with disconnecting batteries. I have read somewhere that moving the key switch to "start" with the cluster disconnected can cause this error ( at least airbag light ) and that a special tool was needed. I supposed that GT1 will be able to do this... but still no luck. May be the module has gone bad ? How could it be checked ?
    I have checked airbag at the connector ( +/- 4 ohm ) with batteries disconnected and avoiding the microswitch at the connector to close the loop., so it does not look a physical airbag issue.

    Cheers,

  5. #5
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    '93 850Ci- Daily Driver
    When you tried to reach out to the Airbag Module with the DIS, did you have the ignition key in position 2? This is required to reach out to the module. You can then read the individual error code, as well as run the system diagnostic for that specific module.
    '93 850Ci - Mineralweiß Metallic

    2001 740iL - Titansilber
    ALPINA B7 -Alpinweiß III


    ...the price of cool ain't cheap!

  6. #6
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    Quote Originally Posted by TxGR8White View Post
    When you tried to reach out to the Airbag Module with the DIS, did you have the ignition key in position 2? This is required to reach out to the module. You can then read the individual error code, as well as run the system diagnostic for that specific module.
    Yes, key at 2. I can reach some other modules... but SRS refuses to be checked...
    Are there some Airbag light codes, like the ones for the stomp test or ASC check ??

  7. #7
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    No luck.

    Just replaced the SRS box with a replacement one, and same issue... Airbag light flashing at "I" Key switch position , also at "II".

    Tried to recode new SRS box, and the car is not able to find it... I have tested replacing the N17 relay.. no luck.

    Will check if +12V present at the SRS plug when key at "I" or "II"

    Thanls.
    Last edited by dudu850; 09-23-2012 at 10:44 AM.

  8. #8
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    Hi dudu850,

    of witch parts consist your DIS equipment? Is this an original yellow head? Or is it just a Notebook with VMware installation of DIS and a USB or serial interface?

    Cheers
    Joachim

  9. #9
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    Quote Originally Posted by ArnoNym View Post
    Hi dudu850,

    of witch parts consist your DIS equipment? Is this an original yellow head? Or is it just a Notebook with VMware installation of DIS and a USB or serial interface?

    Cheers
    Joachim
    Hi. I have tested with both, an old desktop computer and a laptop , using serial interface ( COM1 : 9600, 8 , N ,1 ) and a rv8flyboy ADS/OBD interface ( configured in ADS mode.. )

    I am able to run diagnostics and read/erase errors for some other modules.. but SRS ( and also EGS )... refuse to be checked. I was able to check error messages from the Airbag module.. but now, something is not working with it... ( after disconnecting the cluster and switching the ignition key to the "I" position by a mistake.. )

    Regards.
    Last edited by dudu850; 09-24-2012 at 01:53 AM.

  10. #10
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    Quote Originally Posted by dudu850 View Post
    ...a rv8flyboy ADS/OBD interface ( configured in ADS mode.. )
    Good morning dudu850,

    that was what I want to know. So there are no problems to expect from this side. Some modules do respond without ads-mode and some do not. With ads-mode all modules should respond.

    What versions of ediabas and dis do you use?

    My last idea to this topic is, might it be, that the battery voltage sinks too much, while you are diagnosing the car?

    Eventually try to keep the power up by using a 13,8 volt power supply or an charger. But keep in mind, the 850 uses about 15 amps with ignition on.

    One note. Last summer I did some work at my EKM-Module and the instrument cluster. I switched the ignition on for several times, without the instrument cluster connected. In my case, this causes no problem to the airbag-Module and the airbag-lamp did not light up. Might be, you have a real and persisting problem at the airbag system of your car. Shorted or broken leads, pushed back pins in plugs, eventually an defective slip ring.

    Best wishes and good success
    Joachim

  11. #11
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    Quote Originally Posted by ArnoNym View Post

    Eventually try to keep the power up by using a 13,8 volt power supply or an charger. But keep in mind, the 850 uses about 15 amps with ignition on.
    Good point... just recharging the batteries to full load ( using the CTEK XS7000 ) before running the DIS again.
    Will retry once recharged and update.

    Thanks Joachim.

  12. #12
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    Hi dudu850,

    you're welcome.

    The CTEK XS7000 is a marvellous charger, but a little weak for keeping the power up while a longer lasting diagnostic session. The CTEK performs about 7 ampere, while the 850 uses between 12 and 15 ampere, with ignition on and engine not running.

    For extended diagnostic/programming sessions i recommend the below linked adjustable power supply. I bought this one year ago and I am very contented with it.

    Kind regards
    Joachim

    http://www.ebay.co.uk/itm/MAAS-SPS-50-II-POWER-SUPPLY-PSU-9-15V-55-Amp-/110936221837#vi-desc

  13. #13
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    Still trying to solve this...

    There is connectivity from the SRS module ( the 8 pin orange X74 ) to the diagnostic head ( 6 and 7 from SRS to 15 and 20 at the diagnostic head ) and seems to be 12V at the pin number 1....

    I have replaced the current module with the replacement one ( after disconnecting batteries ) and still not able to get info... When checked at the diagnostic plug.. and checking the pins suggested by DIS, it seems that pin 15 has low voltage...

    Any clues ?

    Thanks.

    PD: car is a 1990 one..
    Last edited by dudu850; 10-12-2012 at 07:58 AM.

  14. #14
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    This is frustrating as everything seems to be ok and no error messages now at the car ( after short test from DIS ), but SRS still refusing to be reached by DIS... Next step is ... connect the diagnostic head directly to the SRS module connector ( X74 ) bypassing the pins 6 and 7 ... that is

    • pin 1 at X74 (+12V ) to pin 14 of the diagnostic head
    • Ground to pin 19 of the diagnostic head


    • pin 6 at X74 (RxD) - to pin 15 of the diagnostic head.
    • pin 7 at X74 (TxD) - to pin 20 of the diagnostic head.

    For pins 6 and 7 i will disconnect cables ( with a switch ) from X74, but the question is... if connected directly ... will DIS/INPA work or will i need a specific reset tool like SIR3 ?

    Thanks.

  15. #15
    Join Date
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    I have the SIR3 as well as the BOA on stock, dudu.
    http://forums.bimmerforums.com/forum....php?t=1460541
    Works on the E31 too.
    Here a comment from a German E34 forum, where he had probs with that and laptop resetting, he got the BOA from meand it worked

    by papercut
    Heute mein BOA erhalten. Erstmal danke an Erich, hat einwandfrei geklappt.
    Habe es mir geholt, da ich aus Versehen ohne KI die Zündung eingeschaltet habe - schon blinkte die Airbag-Lampe. Mit meinem Laptop und den einschlägigen Tools bin ich nicht ins Airbag-Stg gekommen. Habe alles versucht, auch den Laptop vom Spezl.
    Mit dem BOA gings innerhalb von 30 Sek, einwandfrei! Qualitativ sehr gut, Anleitung kurz und knapp, aber verständlich und absolut ausreichend.
    brief translation:
    received today my BOA. Thanks to Erich, worked well.I bought the tool as I by mistake switched the ignition on with cluster removed-airbag light started blinking immediately.
    I tried everything to solve the problem, with my laptop as well as other known tools I could not get into the airbag control unit. I even tried the laptop of my wrenching buddy.
    The BOA worked within 30 seconds. Very good quality, owners manual short, but absolutely sufficient and understandable.

    -----------------------
    Cannot guarantee that it solves your problem, but you might give it a try.
    Have stock in Germany and Japan.

    Erich
    Shogun tricks and tips for the E32 series are HERE!

  16. #16
    Join Date
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    '00 Z3C, '70 XJ6
    Only a few tools will connect with the early SRS modules. I tried 4 different systems unsuccessfully before having luck with a BAUM CS2000.

    Good luck
    2.8 Z3 coupe + 6 speed || 200kW electric 1970 Jaguar XJ6

  17. #17
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    This is to confirm that the SIR3 as well as the BOA work on all BMW from 1987-
    see the comments, even from E30 drivers. E31 850, here one comment:
    http://forums.bimmerforums.com/forum...4&postcount=52
    These units do of course NOT work on BMW with Conditioned Based Service / CBS.
    Shogun tricks and tips for the E32 series are HERE!

  18. #18
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    Thanks guys.

    Will update.

  19. #19
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    Just connected the SIR3.. and flashing codes are for a "wiring issue".... so , will need to check all the wiring coming from /to the SRS module to check for some shortcut ( or open circuit ) "somewhere"....

    What i do not understand is that from the X74 connector there are no issues to the diagnostic connector at the hood...


    • pin 6 at X74 (RxD) - to pin 15 of the diagnostic head ( worked )
    • pin 7 at X74 (TxD) - to pin 20 of the diagnostic head. ( worked )

    so, what should i check and where ?

    Will update...
    Last edited by dudu850; 11-05-2012 at 04:18 PM.

  20. #20
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    98 Euro M3, 04 M3, 06 M5
    any updates? i am trying to read the SRS module from my 92 without any luck. I can read all other modules fine as well.
    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

  21. #21
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    Quote Originally Posted by legoman67 View Post
    any updates? i am trying to read the SRS module from my 92 without any luck. I can read all other modules fine as well.
    Not really... I need some free weekend time to work under the right side dash and check if ground ( and also rest of cabling ) are ok. Also will try to connect the SIR3 directly to the X74..

    I promise to update this post when different tests are completed, as it can be useful for others.

  22. #22
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    FIXED !!!!

    This did the trick..

    http://forums.bimmerforums.com/forum....php?t=1639045

    Connected to the X74 side of the SRS module directly, cutting the lines at the Airbag Module side.. then connect them to the SIR3 as supposed to be and not worked, then following the previous post.. and.... FIXED !!!! Bye, Bye Airbag light...

    Will check anothr day is DIS is now able to recognize the module...

    Cheers.

  23. #23
    Join Date
    Apr 2009
    Location
    Vancouver Isl, BC, Canada
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    98 Euro M3, 04 M3, 06 M5
    i wonder if i can get dis to do it hooked up like this....
    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

  24. #24
    Join Date
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    another happy customer for my reset tool
    I also have besides the SIR3 shown here
    http://tinypic.com/usermedia.php?uo=...LBZYh4l5k2TGxc
    the BOA, which is basically a SIR3 with additional cable loom and plug and software for OBDII, so that covers all BMW from 1987-early 2006 and also Mini and Rover from 2001, excluduing CBS= condition based service which was intriduced first in the new 7 series
    http://tinypic.com/usermedia.php?uo=...FaJoh4l5k2TGxc
    easy to use tool, no laptop necessary and in addition it also resets inspection/oil/annual inspection lights. Fits in the glovebox.
    Only disadvantage, it does not read codes. Only resets them.
    Shogun tricks and tips for the E32 series are HERE!

  25. #25
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    Bump...

    ...the strange issue with the SRS not able to communicate with DIS, seems to be causing some troubles to some other modules as revtor pointed at 8er.org ... Now i am not able to get data from the EML/DME... ( neither from SRS... )

    How should proceed ? Disconnecting the modules one by one and check cabling can be a nightmare... but i have no other idea about how to deal with this..

    Thanks.

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