displaying posts 1 to 15 of 15

Author Subject: AirBag system FAQ
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #1
This FAQ looks at (very common!!) problems with the p2\3 306 airbags and how to fix them.

Typical behaviour when you have an airbag issue: upon starting the car orange 'airbag' light flashes before going on solid after about 5 mins.

I believe the pretensioner light (picture of seatbelts) also is supposed to behave in the same way, but when i had problems it would come on solid part way through a journey!!

In a lot of cases the problem lies with the 2 orange connectors under each of the 2 front seats. You can sometimes confirm this by wiggling the connectors with the engine off and bringing a short term fix to the problem. It becomes especially bad if you move the seats a lot for different drivers or back seat passengers. To fix this you need to replace the connectors.

IMPORTANT:

Before doing any work on the airbag system disconnect the battery and tie the cable out of the way! Dont touch any of the airbag circuits for 10mins. Disconnecting the battery should also mean airbag faults will be cleared (always has for me when the prob has been fixed) when reconnected.

The process is the same for both front seats altho you must remember to raise the drivers to max.

Using a torx socket undo the 2 bolts holding the rear of the seat, then slide the seat forward and do the 2 at the front.

bud_205 has attached the following image:

Posted 16th May 2006 at 06:43
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #2
Just lean the seat back with the back rest released so you can get to the wires underneath - avoid stretching them.

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Posted 13th May 2006 at 16:18
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #3
Cut the connectors out and replace them with something reasonable. Be methodical and use labels (bits of tape) to make sure you know which wires to join.
Put everything back together.

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Posted 13th May 2006 at 16:19
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #4
STEP 2:

If when you reconnect the battery and test you still have problems the next stage is to check that the connector to the airbag ecu is attached correctly and to replace the 2 connector plugs near to it. The ecu is located under the centre console.

Remove the rear ashtray in the centre console and undo the 2 torx screws.

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Posted 16th May 2006 at 06:36
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #5
Remove the 2 screws, 1 either side in the console in the footwell.

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Posted 13th May 2006 at 16:19
bud_205

Regular

Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #6
Pull the gear lever gaitor off and undo the 2 x 10mm bolts.

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Posted 13th May 2006 at 16:20
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #7
Now is a fun bit Smile

* The centre console comes out in 2 sections.
Rear section first:
* Handbrake fully on.
* Try to slide out over handbrake handle, if it wont go you will have to pull the handle off the handbrake.
* Angle the gaitor to get it thru its hole.

Remove rear section:
* Handbrake fully off.
* Push console sideways and up around handbrake.
* Unplug ash tray light connector (pic)
*Remove front section.

bud_205 has attached the following image:

Posted 16th May 2006 at 06:39
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #8
This is the airbag ecu, check that the big connector (arrowed) is pushed on nice and tight and that all the visible wire is good.

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Posted 13th May 2006 at 16:20
bud_205

Regular

Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #9
Cut out the connectors and replace them as you did before. This time wrap the wires in tape to protect them from chaffing and fasten them down to their original mounting points. Put everything back together.

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Posted 13th May 2006 at 16:20
bud_205

Regular

Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #10
STEP 3:

If you still have the orange light then nevermind you arent beaten yet!

You may have a problem with the rotary switch which resides on the steering column. These cost about 35 from pug dealer.

Undo the 3 torx screws on the underside of the steering column cover.

Remove the upper and lower covers steering column covers.

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Posted 16th May 2006 at 06:49
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #11
Undo the 2 torx bolts found in recesses in the back of the steering wheel and unplug and withdraw the airbag unit carefully and put it out of the way somewhere.

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Posted 13th May 2006 at 16:21
bud_205

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Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #12
Loosen (DONT UNDO FULLY) the bolt holding the steering wheel on and give the wheel a rattle to loosen it on its splines.Position the steering wheel so that the roadwheels are perfectly straight and mark the position of the wheel in relation to its surrounding splines so it can be replaced in the same place.

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Posted 13th May 2006 at 16:21
bud_205

Regular

Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #13
Remove the steering wheel to reveal the rotary switch!! Undo the 3 torx screws.

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Posted 13th May 2006 at 16:21
bud_205

Regular

Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #14
And unclip the connector, you may need a little flat screwdriver behind it to release it. I also removed the left hand control stalk. Finally remove the old rotary switch.

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Posted 13th May 2006 at 16:21
bud_205

Regular

Location: Bromsgrove

Registered: 02 Mar 2005

Posts: 144

Status: Offline

Post #15
The new switch has a paper seal to prevent it spinning, dont unpick this just fit it to the car fully intact. The airbag connector should be at the '9 OClock' position and so the space in the back of the steering wheel should fit back over it. Refit the wheel according to your marks. Put everything back together.

I would expect that addressing the above areas will fix the majority of airbag system faults and are a good starting point.

If you still have problems then you could try checking the continuity in the wires between airbag ecu and seats\wheel. Never connect a test meter to the airbags or the airbag ecu but you can test wires not connected to any components as long as you are sure this is the case. I would like to know how you test the airbags\pretensioners!!

You may have to admit defeat and take the car to a main dealer for diagnosis.
Posted 16th May 2006 at 06:42

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