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BMW E39 5 Series 1997-2003 (525i, 528i, 540i, M5, sport wagon) Airbag light


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Last Post: Oct 1, 2004 2:29 PM Last Post By: DJBlack
manuel_menendez_

Posts: 75
Registered: 12/09/03
Airbag light
Posted: Jul 6, 2004 6:06 PM
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Hi, last week the light of the airbag failure turn on, a friend of mine who have a fault code reader of BMW check it and appears that a pad that goes under the seat is damage, I want to know if that procedure need a qualify technician to perform it, because I doubt that a airbag light could be reset easily.

thanks
mjms
Hasso

Posts: 503
Registered: 12/09/03
Re: Airbag light
Posted: Jul 7, 2004 10:35 AM   in response to: manuel_menendez_ in response to: manuel_menendez_
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Hello Manuel.
A very commen faulty on BMW is the cables to the belttensior under the seats. Repairkit of cables is about $40.
The second common faulty is the seatoccupationsensor in the passangerseat, if you put a knee or a hand in the middle of the seat the sensor gets faulty.
If you only get a couple of seconds of bad connection in the airbagsystem when you have the ignition on it will turn the airbaglamp on.
I get problem whid this "senorscarpet" ($100) and I spend lots of time to do a simulation of a passenger instead so the passenger airbag always whould be active.
BMW take $ 440-460 to change it (you could to it your self )
My passengerseat is nearly not used and my airbaglight turns on if the car was placed an hour in the sun.
And replace something that can be fautly the day after again was not wat i want.
You can use a 56kOhm resistor, and a 1N4002 diod and a 100pF capacitor parallelconnected instead of the sensor.
There is a elektronicmodul under the back of the
http://www.autopower.se/galleri/hassos_bilar/bilder/031009_6.jpg
seat that make a AC 4V signal to the sensor, I use a new "sensor" and a occiloscoop to find out what was happening in the system.
http://www.autopower.se/galleri/hassos_bilar/airbag/default.asp
The sensor is only fore saving money fore a airbagexplosion if you smasch the car and not have a passengar, but if you should pay a repair of sensor 3 or 4 times, and how often will you crasch??
But you cant reset the airbaglight your self without resettool or diagnostic program.
http://www.autopower.se/galleri/hassos_bilar/bilder/031009_8.jpg
http://www.autopower.se/galleri/hassos_bilar/bilder/031009_7.jpg
http://www.autopower.se/galleri/hassos_bilar/bilder/031009_9.jpg

You do this modifikation on your on responsible of course.

Message was edited by: Hasso

manuel_menendez_

Posts: 75
Registered: 12/09/03
Re: Airbag light
Posted: Jul 7, 2004 2:15 PM   in response to: Hasso in response to: Hasso
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Hasso extremely appreciated your reply, I will see if I can make the "sensor" with those electrical components, unfortunately I don't have that tool you show me on the pictures, I have the peake research one but I don't think it erase that warning light. Hasso did you know if I can buy the pad that goes under the seat through the web??

thanks
mjms
Hasso

Posts: 503
Registered: 12/09/03
Re: Airbag light
Posted: Jul 7, 2004 3:32 PM   in response to: manuel_menendez_ in response to: manuel_menendez_
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I think its only BMW who has this part.
You can always go to your dealer to reset the airbaglight
i should not coust more then $15 .
I get my resettool from USA (made in germany:) )
but they have other models and not the same that i buy
http://store.yahoo.com/eagleday/nebmwsereto.html
You need a little more instruction in englisch to make a sensor ,so keep in touch :))
Charlie

Posts: 4,783
Registered: 12/09/03
Re: Airbag light
Posted: Jul 13, 2004 8:50 AM   in response to: manuel_menendez_ in response to: manuel_menendez_
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What is the model and year. I can try and get you the pad part number.
Charlie

Posts: 4,783
Registered: 12/09/03
Re: Airbag light
Posted: Jul 13, 2004 9:42 AM   in response to: manuel_menendez_ in response to: manuel_menendez_
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The seat covering needs to come off and the pad replaced. Once replced, your fiorneds tool should be able to reset the light.
manuel_menendez_

Posts: 75
Registered: 12/09/03
Re: Airbag light
Posted: Jul 13, 2004 10:55 PM   in response to: Charlie in response to: Charlie
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HI charlie, my car is a 1997 528i but the seats where an upgrade of a 2000 540i sport package. Could you explain me how to remove the cover to access the pad??

thanks
mjms

Hasso

Posts: 503
Registered: 12/09/03
Re: Airbag light
Posted: Jul 14, 2004 2:22 AM   in response to: manuel_menendez_ in response to: manuel_menendez_
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Here you can se how on pictures how the seat is put together. This is fore repair of heated seats but ist nearly the same thing.
http://www.touringklubben.com/stol_e39.asp

And on the picture it the EU partnumber fore sportseats
the price is $96.
The other pictures is fore change on ordinary seats.
I know some ordinary BMW owners (not proffs mecanic) who change this without problems, it take same time to do it but its a very money saving, the dealerprice is $430 in its working time .

But it could also get faulty next week after you changed it if you are unlucky, thats why I dont change my and my seat is not used many times but I got this problems anyway

BMW could also if they want, deacctive the sensor in the softwere og airbagsystem, the passengerairbag is then always acctive even without passenger,(same thats my simulation) the sensor is only fore saving money fore the insurance company, but it could be a big coust fore the carowner if he needs to change this 3-4 times fore example.
And repair this 2 times is a higher coust then an airbag exchange

Message was edited by: Hasso

Charlie

Posts: 4,783
Registered: 12/09/03
Re: Airbag light
Posted: Jul 14, 2004 9:38 AM   in response to: manuel_menendez_ in response to: manuel_menendez_
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Looks like Hasso took care of this. Thanks Hasso. I agree with Hasso, it is a delicate part. I have the same failure in my car, my small son likes to kneel on the seat (second pad!).
manuel_menendez_

Posts: 75
Registered: 12/09/03
Re: Airbag light
Posted: Jul 14, 2004 6:02 PM   in response to: Charlie in response to: Charlie
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thanks for the feedback, greatly appreciated.

mjms
DJBlack

Posts: 25
Registered: 08/18/03
Re: Airbag light
Posted: Sep 25, 2004 7:36 PM   in response to: Hasso in response to: Hasso
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Hi there...

Can I ask if you have a picture of the 56kOhm resistor, and a 1N4002 diode and 100pF capacitor in place? I assume its a two wire sensor plus... which end of the diode goes to which coloured wire? Can you also confirm that the three components are in parallel?

Last question - your reset tool - can I ask where you bought it, and, can it reset the CLOCK symbol that lights for the brake fluid change (2 year)? If so, can it do it independantly from an Inspection reset?

Many thanks in advance

David
DJBlack

Posts: 25
Registered: 08/18/03
Re: Airbag light
Posted: Sep 25, 2004 7:38 PM   in response to: DJBlack in response to: DJBlack
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Hi again...

Had another look at your pictures, and it looks like the three components are not in parallel.

Can you confirm...?

Thanks

David
Hasso

Posts: 503
Registered: 12/09/03
Re: Airbag light
Posted: Sep 27, 2004 3:58 AM   in response to: DJBlack in response to: DJBlack
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Its parallel. I have only put test the resistor on the otherside of the "sugerbeet" as whe called these connecters in sweden.
The blue cable should be connected on the diods not leading side. (there the line is)
I have last week try to translate the whole repotage to Englisch and I send it to Charlie so he can check it out.
You can look at this pictures instead.
http://www.autopower.se/galleri/frilansare/hasso/airbag/default.asp
Notice you do this simulation on your own responsibility.

( I have done this at some E46 cars this month without problem) I have also send a kit /diod, resistor, capacitor to some of my BMWfriends who fixed the rest by them self ,the most BMW modells have the same partnumber on "canbus" under the seat)

Message was edited by: Hasso

Message was edited by: Hasso

Charlie

Posts: 4,783
Registered: 12/09/03
Re: Airbag light
Posted: Sep 27, 2004 11:53 AM   in response to: Hasso in response to: Hasso
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Volvo makes an airbag simulator tool, costs like $US18. Plugs into harness in place of airbag for testing purposes. Handy little thing for you Hasso?
Hasso

Posts: 503
Registered: 12/09/03
Re: Airbag light
Posted: Sep 27, 2004 12:46 PM   in response to: Charlie in response to: Charlie
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I cant see any reason why a Swedisch Tractor should have an airbag, Yes I know its possible one of the most safe tractors in the world:)
Normally when you take away a passenger airbag you put a 2,2Ohm resistor instead of the airbag but I dont know i this work on the cars today.
$US18 is more money than I would spend to buy a Volvo :)
(OK its a very high quality traktor)

Yesterday I heard a wonderful sound a couple of streets away, my ears told me long before I see any car that is was an Modified FORD V8. Yes!! my old sense is still working and my heart get dubble blows.
I Yellow/Black Mustang Mach I -1969 with highlifte camshaft and high compression, with a sound that is the best music in the world passing my house in slow speed.
Fore 25 years ago i could tell only to use my ears long before I see a american car. If it was an FORD, DODGE. CHEVY, OLDS or Pontiac V8 ,they all have a differnt sound.
Now I am glad I have one off this sense left :)

Message was edited by: Hasso

Hasso

Posts: 503
Registered: 12/09/03
Re: Airbag light
Posted: Sep 27, 2004 12:52 PM   in response to: Hasso in response to: Hasso
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Now its time fore a little more serious things.

As Charlie alredy knows I try with a translationprogram to translate the simulationreport on the link above.

So DONT laugh if there is words and menings that you dont understand... I dont do it eighter :)
http://www.autopower.se/galleri/frilansare/hasso/airbag/default.asp
Se attackt files and use the the pictures on the link above.

Message was edited by: Hasso

Message was edited by: Hasso

Message was edited by: Hasso

DJBlack

Posts: 25
Registered: 08/18/03
Re: Airbag light
Posted: Oct 1, 2004 2:29 PM   in response to: Hasso in response to: Hasso
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Hi Hasso
"sugerbeet" - that is funny!!!

We call it "barrier strip" or for those who dont know better, they call it "Chocolate block"!!!!

David

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