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Old 03-07-2019, 05:54 AM
Tankut Tankut is offline
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Bmw E38 Steering Wheel Airbag problem

Hi,

I own an E38 728i (1998) which recently gave an airbag fault code. My car mechanic did all the tests and found out that the problem is steering wheel airbag, he even sent it to a local guy who cleans them from moisture and fixes airbags. But after we connect it back and clean the fault code. The airbag light comes back after around 15 minutes to 1 hour driving. It can even come back after 5 minutes. He insists on the problem is located at the SRS ring sensor back of the steering wheel which costs around 150 quid in my country.

I was thinking to buy an airbag bypass resistor fuse just to test the airbag SRS ring, because I trust my mechanic but not the guy who fixed/cleaned the steering airbag. But I do not know the resistance type for my car which also has a single stage deployment airbag. A guy from the UK I contacted today who sells those bypass resistors say that BMWs often use either 2.2 ohm or 3.3 ohm resistors but he says that he does not have the data for my BMWs model.

Does anyone know which resistor value is right for the BMW E38 model 1998 with single stage deployment airbag?

Regards,
Tankut

Last edited by Tankut; 03-07-2019 at 06:00 AM.
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  #2  
Old 03-07-2019, 06:16 AM
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Doug Huffman Doug Huffman is offline
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So your's is not included in the nearly world wide universal TAKATA airbag safety recall?

The recall was caused by just that issue, humidity moisture absorption causing detonation of the charge rather than a nice 'slow' inflation. A few people world wide have been killed by shrapnel from their airbag.
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Last edited by Doug Huffman; 03-07-2019 at 06:18 AM.
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Old 03-07-2019, 06:33 AM
Tankut Tankut is offline
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Mein Auto: BMW E38 728i 1998
Well I bought the car 7 years ago second hand and never had any issue. I did not know about that TAKATA airbag recall thing since now. I did a quick research and I think that list is about the airbags between 1999-2015 and there are no 7-series in that list as I see. So I guess not. I just need the resistance ohm value for the E38 1998 with single stage deployment airbag (which are the models before 2/1999), so I can buy the right one to test the SRS ring sensor, before I change it.
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Old 03-10-2019, 04:17 AM
Tankut Tankut is offline
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I have recently learned from an expert that steering wheel airbags and instrument panel airbags have 2.0-2.2 ohm resistances and side door airbags have 3.3 ohm resistances. So anyone needs the info, it is here. I ordered mine and will test it and update the post later.
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Old 03-11-2019, 06:31 AM
chrisn7 chrisn7 is offline
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If you want to test the slip ring (which is what I guess you refer to as the SRS ring sensor), just remove the steering wheel and the slip ring. There are 2 or 3 sockets on the top side (depending on the wheel functions), and matching ones on the underside. You can then check for continuity / resistance across the pins to the largest plugs.
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Old 03-13-2019, 04:01 PM
Tankut Tankut is offline
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I have actually connected the resistance today and deleted the fault code. After around 10-15 minutes the airbag light came back. So I already ordered the slip ring from the local BMW dealer today (cost around 150 quid) and my mechanic will install it next week. At the same time we have a new problem which is the passenger door got locked and can not be opened neither inside nor outside. My car mechanic could not open the door. We know that the problem is with the actuator but we can not reach it because we can not remove the door panel when the door is locked. I am thinking to open a new post about that but I do not know if anyone can help me with that.
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