1995 E36 318is coupé airbag investigation

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  1. 1995 E36 318is coupé airbag investigation 
    #1
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    jcd06's Car Details
    Model of Car:
    318is
    Year of Manufacture:
    1995
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    I got this car recently and I am currently refurbishing it so it'll become my daily driver.
    I noticed the airbag light stays on

    I had a look at the airbag system but couldn't find any anomaly so one of these days I'll visit the dealer for a diagnose and reset.

    Meanwhile I'll tell you my findings.
    Refering to the Bentley E36 manual page ELE-141.
    I discovered that on my car there was only a driver's airbag, there were no seatbelt switches nor seat occupancy detector.
    These wires are even not present at the plug of the SRS module. As these devices often seem to be the cause of failure, I am happy that I don't have them

    So what's left? The airbag itself, the contact rings, the module and the indicator light.
    Measured all with an ohmmeter and all looks right. Airbag measures 0.2ohm. The circuit is OK upto pins 10 and 11 of the SRS module plug.

    I'll let you know what the dealer says.
    When we all think alike, no one thinks very much.
    -Walter Lippmann
     
     

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    #2
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    Small update in the airgag history
    I went to an old-fashioned non-dealer mechanic guy who attempted to read out and reset this misery.
    He got a code that said the "device does not connect" (free translated from German).
    His opinion is that the control module is bad.

    I'll go to a dealer and see what shows up there with genuine equipment/software.
    When we all think alike, no one thinks very much.
    -Walter Lippmann
     
     

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    #3
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    I just came back from the dealer.
    Same story, they can't connect, neither to readout for a spare key.
    The guy said there was a problem with the TXD line on the data link connector.
    Unplugging the airbag module didn't change a thing.
    Ugly

    I'll use the forum search function and the ohmmeter...
    When we all think alike, no one thinks very much.
    -Walter Lippmann
     
     

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    #4
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    There was nothing at all to find with the ohmmeter; all wiring is OK.

    I got the advise to go to a dealer and ask for a particular technician to look at this.
    He found out that the ZKE Body control module was disturbing the TXD dataline. What he did is he cut the wire connecting the module to the TXD line and so everything works except the diagnose of this module.

    Once the TXD line was OK, he could just reset the airbag light...

    The guy charged for only half an hour work so this turned out a cheap repair.

    I'll take my time to look after a secondhand ZKE but meanwhile the car is ready for MOT check.
    That's planned for tomorrow, woohoo
    When we all think alike, no one thinks very much.
    -Walter Lippmann
     
     

  6. The Following User Says Thank You to jcd06 For This Useful Post:

    steve23002 (18-10-2009)

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    Good with the MOT check. Im sure it will be fine....
     
     

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    #6
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    Quote Originally Posted by steve23002 View Post
    Good with the MOT check. Im sure it will be fine....
    And that it was

    So it passed the test...

    Just got a remark for the back box flaking off (some kind of metal lepra) but not leaking so that's ok.
    A second remark for oil or coolant leak. That surprised me and I had a look under the car
    It seems to be coming from the front right of the HG, or the rubber profile gasket. Tomorrow I'll clean it all and try to look from where it leaks.
    I hope the head doesn't have to come off again
    When we all think alike, no one thinks very much.
    -Walter Lippmann
     
     

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    steve23002 (20-10-2009)

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    #7
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    The leak was at the two o-ring bush between the engine block and the part carrying the oilfilter.
    It probably started leaking because I used thicker oil. The old o-rings were quite crispy, they broke when I got them off.
    Fixed this yesterday, was no big deal

    Time to update the project thread...
    When we all think alike, no one thinks very much.
    -Walter Lippmann
     
     

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