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Porsche Specialist Surrey, Porsche Specialist London, Porsche Specialist East Sussex, Porsche Specialist West Sussex, Porsche Specialist South

Seat Belt Tensioner - Airbag Light

Ok Iain.. I appreciate your advice and concern.
I have also ordered some 2.2 Ohm resistors.
Which might be a safer way to test, by installing in place of the seat belt reel and seeing if fault code clears/changes.
Although having said that, I think swapping the reels for side to side should tell me what I need to know.
 
Im probably over the top when it comes to safety , im sure its fine but i try to point out any possible problems .. i worry .

I tend to nag the other mechanics at work when it comes to safety .. they often tell me to shut up though !!

Just ignore me :)
 
Stripped out the Passenger side today and alas no different from Driver side.
Looked in fine health and the belt tensioner reading was same as Drivers side at 2.2 Ohm.
I did establish that the Drivers side IS the drivers side, as I ran a scan while the pre-tensioner connections were apart, and saw an additional two codes pop up. No 24 and 25 both saying "Belt Tensioner, Passenger"
Couldn't go any further as couldn't clear the passenger side faults even though they were back together. So I'm now doubting whether the Autel is capable of resetting the Airbag system. (It cleared an ABS fault code)
Plenty of Internet clips showing people using the Autel for the Airbag light on 996's so I'm confused and reluctant to go further until can be sure have a reader that works!
So, while I'm considering next move. Is there any significance between the fault numbers? I expected Passenger side disconnected to be 07?
Obviously one of the passenger fault codes was for an Open Circuit, So maybe Code 06 would indicate something different? Like a bad Ground?
Another thought.. should I have started with a Battery disconnect/reset?
 
If driver's side is drivers side then 07 would be drivers side and not passenger side as in the fault code test plan .

I can't seem to find info on the passengers side fault codes .. hmm .. trouble is i use a tester and the autologic often gives a description or i can look it up on the work computers .. at home and what i have is limited .

End of the day .. if you can't clear a fault code on the airbag system then you won't be able to diagnose this fault ... once an airbag code is logged it can only be cleared with a tester .


Atm .. my concern is this may turn out to be the control unit that's at fault .. both seat belts have showed the same resistance so logically they are both ok .

I feel .. sorry .. it might be best to book it in .. does not have to be with us but i think going forward that might be the best way forward ... 1 hrs diag and see what the garage finds or if they have to spend longer .

OPC will actually have the tool to plug in and test.
 
Thought I would do a conclusion to this post in case anyone had same problem in future.
I couldn't find anything wrong so had to concede defeat and book it in to specialist.
My nearest Indie is 9E. They confirmed the same codes as I got, but couldn't clear, so set about doing a full investigation.
They didn't find anything wrong with wiring or airbags or seatbelts either... so we had to conclude it was the Airbag controller.

Porsche price for exchange Airbag controller was £800+Vat!!!
But Adam at 9E very kindly allowed me to source one myself through Ebay (obviously at my risk of it not working)
Fortunately, I found one for £50 and it did the trick... no more airbag light and it's back on road.

Not sure I can give any moral to the story. It's disappointing for Porsche diagnostics not to give a true indication of where the problem was. Maybe the only advice worth anything, if attempting the job yourself, is to consider changing the controller yourself as part of the sequential fault finding (assuming you can find one cheap)
 
It is very rare for a code to get stuck in this control unit .. I've only replaced a few in 16 years for a stuck fault .. the annoying thing is .. it's the software .. unlike a home PC though we can't reprogram it .

996 and im afraid its an early diagnostic system .. the codes are not that accurate and it just reports what it sees .. and as its the control unit that's reporting it can be inaccurate when its the problem .

I was concerned it could possibly be this but at least a second hand unit fixed it :thumb:
 
This has been useful to read, unfortunately I was involved in a front end. The car is rebuilt but the airbag light keeps popping up. I am thinking I need to replace the seat belt tensioners and the ECU. I am going to 9E for them to have a look at.

Any other advice?
 
Airbag light on and there will be a fault code .. this will say what the fault is or what the car is seeing and as such generating the code .

Crash sensor or airbag control unit is what i would guess at but 9E are an excellent garage and can easily help you out .

FYI .. i don't work there so no affiliation .
 
ganan53 said:
This has been useful to read, unfortunately I was involved in a front end. The car is rebuilt but the airbag light keeps popping up. I am thinking I need to replace the seat belt tensioners and the ECU. I am going to 9E for them to have a look at.

Any other advice?
Click to expand...

Seatbelt tensioners will only need to be replaced if they have deployed which will be apparent if the seatbelts will not reel back in or pull out ie they will be locked. Do they even come up as an airbag fault - ?

Presumably if the airbags have been replaced then the code should have been cleared.

I will be interested to see how you get on before I fir my home made passenger dash airbag on/off switch.

Pip
 
So with mine the airbags deployed, and I believe the seat belt tensioners did too. They are however working again and do pull tension when I pull hard.

For my own piece of mind I've ordered new seat belts and temionsers. I'm seeing Ken tomorrow so hopefully he will have some answers.

Ill post up what we find.
 
I believe that the seatbelt tensioners lock the seatbelt on impact so there should be no way of lengthening their extent or winding them back in. No movement at all. If you imagine little explosives that locks the seatbelt in its position on impact that is the tensioner.

If you can pull them out and they retract it sounds as if they have not activated. It may also mean that you do not have pretensioners.

Is their a little plug on it with wires coming out of the mechanism where the excess belt winds in??

Pip
 

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