Airbag light on, advise needed.

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lee1980wolves
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Airbag light on, advise needed.

Post by lee1980wolves » Fri Jan 13, 2017 4:14 pm

My airbag light has always came on now and again since I got the car. It's probably been caused as I always had a leak in the passenger footwell but I fixed this months ago by unblocking the holes under the battery and now it stays dry in all weather. I can normally clear the light via the OBD reader and it won't come back for months but now it goes out for a minute or two at the most and then comes back on.
From what I've read on the forums, it could be the yellow connector under the passenger seat or the airbag sensor under the carpet below the passenger seat. I tried reconnecting the yellow connector, cleaning it and reconnecting but the issue still remains.
What should my next step be? From what I've read, I could try removing the seat and cutting the connector block off and reconnecting the wires or replacing the sensor below the carpet or something else?
The code it throws up is 01221.

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ct.p
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Re: Airbag light on, advise needed.

Post by ct.p » Fri Jan 13, 2017 5:08 pm

With it disconnected and isolated from a battery supply, I'd carefully check for continuity of the cables using a digital multimeter. Wiggle the cables about if needs be, could be a stress break / fracture in the cable(s) and or connector(s).
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lee1980wolves
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Re: Airbag light on, advise needed.

Post by lee1980wolves » Fri Jan 13, 2017 5:32 pm

ct.p wrote:With it disconnected and isolated from a battery supply, I'd carefully check for continuity of the cables using a digital multimeter. Wiggle the cables about if needs be, could be a stress break / fracture in the cable(s) and or connector(s).
Thanks. So I should disconnect the battery when I use a multimeter? How will I detect a current? Sorry for being dumb, Im not too great with electrics.

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Re: Airbag light on, advise needed.

Post by ct.p » Fri Jan 13, 2017 5:46 pm

lee1980wolves wrote:
ct.p wrote:With it disconnected and isolated from a battery supply, I'd carefully check for continuity of the cables using a digital multimeter. Wiggle the cables about if needs be, could be a stress break / fracture in the cable(s) and or connector(s).
Thanks. So I should disconnect the battery when I use a multimeter? How will I detect a current? Sorry for being dumb, Im not too great with electrics.
It might be best for you to entrust it to an auto electrician then.

There are obvious safety issues when working with airbags. You must remove any power from the airbag system, battery off, then wait for a the capacitors in the airbag system to discharge.

Reason for using a digitial multimeter for continuity testing is that they will not send anything out that could accidentally trigger an airbag.
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lee1980wolves
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Re: Airbag light on, advise needed.

Post by lee1980wolves » Fri Jan 13, 2017 6:17 pm

ct.p wrote:
It might be best for you to entrust it to an auto electrician then.

There are obvious safety issues when working with airbags. You must remove any power from the airbag system, battery off, then wait for a the capacitors in the airbag system to discharge.

Reason for using a digitial multimeter for continuity testing is that they will not send anything out that could accidentally trigger an airbag.
Thanks for explaining that. I'd rather not spend more money than I have to so I will try to tackle this myself with the utmost care and not before ensuring that whatever I do, is the correct way. I can manage disconnecting the battery and waiting a while for the capacitors to uncharge. I didn't know how to do continuity testing with my multimeter but after Googling it I'm fine with being able to do that.

If it turns out the wiring is ok, should my next step be to by pass the connector, replace the sensor or something else?

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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 11:19 am

Bump. I got my MOT looming over me in next couple of weeks so I need to get this sorted. Any other input please?

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 12:10 pm

Try to get vcds cable, you will see what fault code you got, and that will show exactly which part is faulty. I had a broken slip ring behind the steering wheel. Replaced that and running fine over year now.

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Re: Airbag light on, advise needed.

Post by ct.p » Sat Jan 14, 2017 12:58 pm

ray112 wrote:Try to get vcds cable, you will see what fault code you got, and that will show exactly which part is faulty. I had a broken slip ring behind the steering wheel. Replaced that and running fine over year now.
Good point there Ray, I assumed it was the passenger seat airbag.
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lee1980wolves
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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 1:13 pm

01221 - Crash Sensor Side Airbag; Driver Side (G179): Open Circuit / Short to Plus

I read it can still be the passenger side though as the wiring passes through there. Not sure what to replace first.

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 1:38 pm

I don't remember fault code, but when I Google it, it showed slip rings problems. Checked with multimeter and it was bad. His fault code shows up like crash sensor fault. But always better check things for anything new before sorting problem

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Re: Airbag light on, advise needed.

Post by ct.p » Sat Jan 14, 2017 1:42 pm

A short to plus fault would lend itself to cable damage, crushed, worn through or both. Question is where.
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lee1980wolves
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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 3:08 pm

Could I remove the clocks and take out the LED or bulb? I don't think it would be an MOT fail and I'm only planning on keeping the car for another year or so.

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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 3:40 pm

Scrap that. just phoned my MOT guy and it would still fail if there's bulb at all :cry:

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 5:24 pm

If car have airbags, light must come on and then go off. if you take bulb out, that will mean fail immediately.

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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 5:53 pm

Yeah I know, I called my MOT guy and asked.

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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 6:02 pm

Do I need to remove the seat and carpet to check the wires?

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 6:06 pm

Seat definitely. Then you will see connector and a bit of wires. You can hope that pins in connector is just corroded, and contact cleaner will sort that. But if fault code tells "short to ground", chance that plug is faulty is pretty small.

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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 6:16 pm

Looking at this wiki link, it seems my code is pointing to the Crash Sensor Side Airbag; Driver Side. It may not be a short though. http://wiki.ross-tech.com/wiki/index.php/01221

Should I first try removing the drivers seat and cutting out the yellow connector underneath and rejoining the wires? I have checked this connector and visually it looks ok and unplugged/reconnected fine.

Once/if this fails to fix it, then proceed to replace the crash sensor located below the carpet?

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 6:21 pm

Crash sensor is in front doors. So you probably need to start looking at door wiring first. Could be just broken wire between doors and pillar. Common problem, and might be easy fix.

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 6:33 pm

Was reading a bit more, and found that for cars build up to 2004 crash sensor is in B pillar(must be middle one ) and after 2004 it's in doors. But the more I read the less I think there will be anything to do with passenger side. It would show then g180 , that's passenger's side crash sensor. So start with checking drivers side wiring etc.
Last edited by ray112 on Sat Jan 14, 2017 6:36 pm, edited 1 time in total.

lee1980wolves
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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 6:34 pm

I thought the sensor was under the carpet in a B5? Is this not true?

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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 6:37 pm

Is the middle B pillar the area between the 2 doors?

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 6:46 pm

Yes mate, but every place I read, is a bit different information. Just now was reading that sensor is under carpet on b5 chassis. Getting confused. Probably best one will be to take seat out and just follow wires, and check for any damage.

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Re: Airbag light on, advise needed.

Post by lee1980wolves » Sat Jan 14, 2017 6:52 pm

Thanks for your help. That's the trouble I was finding, conflicting info.

I shall remove the seat and carpet drivers side, check all the wires and replace the sensor.

If that fails, I may have to just find a friendly MOT guy as I can see this just being a nightmare trying to fix it if the obvious fixes fail :sad:

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Re: Airbag light on, advise needed.

Post by ray112 » Sat Jan 14, 2017 7:28 pm

Exactly what I was thinking. Friendly mot guy will let it through. Maybe you will need to add few quid more for test. I did that two or three years ago, when slip ring behind steering wheel was faulty. Fixed it when I was fitting leather steering wheel from gti golf. All at once ;) ,but slip ring is a lot easier fix, especially on car without stability control. Good luck with sorting your problem mate, keep us updated how it goes.

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