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obin robinson

'02 996 Airbag light on with Belt Tensioner Error Code 23

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The Airbag light came on in my 2002 996 while I was on a long drive. I used my Durametric scanner and found that the fault says:

 

Airbag B05

Current Fault Codes

23

Belt tensioner, drivers

 

---

I've checked the archives and could not find this exact issue. I've cleaned the contacts with spray contact cleaner but the code did not clear. Do I need to replace the belt buckles? What is my next course of action?

 

Thanks in advance for any help you can offer.

Belt Tensioner Fault 31-July-2019.JPG

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Fault 23 

 

Possible cause of fault:
- Incorrect coding
- Short circuit to B+/ground or open circuit in the wiring between the driver's seat belt tensioner and the control module
- Driver's seat belt tensioner faulty
- Triggering unit for airbag faulty

 

 

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Thank you. Would you recommend I just clean the connections up or is this something I have to bring to a dealership? I have a lot of mechanical and electronic experience. Where is the tensioner located? Where is the triggering unit located?

 

Thanks again.

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Posted (edited)

I believe the seat belt tensioner is located in the B pillar....where the seat belt rolls back into the pillar.

Here is what I would do, pull the seat belt out all the way several times and see if it rolls back up correctly.

Then clear the code and see if it comes back.  It might just be an anomaly.

My seat belt light came on unexpectedly last evening.  Never before.  Once I hook up my  Durametric this morning, I am curious to find out what triggered it.

It was the passenger seat buckle. Cleared code, light is out. Shot some electrical contact cleaner in the buckle.  We shall see.

Edited by DBJoe996

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I pulled the seat belt out several times and let it reel back in. It rolls back up correctly. The code keeps popping up. Can I just take that trim off and check the wiring? I don't want to set the airbag off.

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can you just clear the code using the durametric?

Its possible that the code just shows up as a "mysterious Porsche thing."

Just clearing it is possibly ok.  It might very well show up again in a few weeks, months, years.  

Check out this issue on the forum.  some people have a durametric just to be able to clear the air bag light.

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I have cleared it with the Durametric scanner and it just pops up again a moment later. I am wondering if it's a loose wire. I just don't want to set the airbag off by mistake.

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Right.  Totally right.  

My light came on at weird moments, but always stayed off for long times.  On longer road trips I had a partitioned MacBookAir with me just to clear the air bag just in case.  Never had it happen though.  My car had the gold contacts in the seat belts.  If you do go to a dealership, bring your credit card.  

Good luck. 

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Using the Durametric tool I have code B05 Drivers Circuit calling for part 996 618 219 01.  Does this indicate I need to change the sensor or should I be looking at something else?  The car is an 02 C2. 

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The log report shows code 21 Airbag B05 and lists that part number.  I am unsure if that means the sensor is simply reading a fault from an unidentified input or if it is that part.  I can’t much much information on code 21. The local shop told me I needed a new airbag, but how can they tell?  I had the signal stock changed a while ago and the the car back in for the steering squeaking.  I am wondering if it is possibly a loose or damaged connection, the clock spring, control sensor or the actual bag. I don’t want to randomly start changing parts. I cleared the fault once and it didn’t come back for about 1k miles.  

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That part is over $1,000. If I knew it needed to be replaced I'd be okay with that. I don't want to buy it to find out I don't need it. Does anyone else have any ideas? Thanks in advance.

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You need more information before replacing the airbag control unit, it may have just lost its connection to the system.  You would be better off having the car scanned with a PIWIS to see if it is a coding issue or a real device problem.

 

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Since they had to take the steering wheel off along with the airbag, could it be they simply forgot to connect it back up?

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On 8/22/2019 at 5:42 PM, obin robinson said:

I pulled the seat belt out several times and let it reel back in. It rolls back up correctly. The code keeps popping up. Can I just take that trim off and check the wiring? I don't want to set the airbag off.

 

OP, have you tried replacing the tensioner? I had this exact problem. Tried everything. Bit the bullet and replaced the seat belt tensioner. Problem solved. 

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