Air bag fault / warning

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

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dirtydirtydiesel
3.0 24v
Posts: 1400
Joined: Sun Apr 28, 2013 11:02 pm
Location: Coalville, Leics.

Air bag fault / warning

Post by dirtydirtydiesel »

Hi all,

Not needed to post for a while due to the old bus behaving her self,
That was up until I bought her replacement :lol:

For a few weeks now I've had on the M.F.D upon turning on the ignition

Air bag fault, followed by passenger air bag disconnected & then the airbag illuminated on the dash
as well as the air bag symbol.

No problem I thought, seat connectors 'WRONG' so had a session with pp2k
Did a global test & came back with this.

Built - in systems interface : Permanent fault. Communication with the airbag E.C.U

Also this

Instrument panel : Remote intermittent fault. No communication on the data wire
& No communication on the data bar wire

I'm stuffed, I have no clue where to start looking

I hope some of you can help.

I can't post pictures, sorry . You will have to make do with me typing out what it says on the screen.

Thanks in advance , Paul.
Last edited by dirtydirtydiesel on Wed Dec 11, 2019 9:34 pm, edited 1 time in total.
2002 110 HDi estate, Rapier in monaco blue! ( found quite a bit more power :cheesy: ) for sale
1999 3.0 V6 SE coupe in Diablo Red ( my baby ) sold
2006 206 1.4 16v sport in Aegean blue ( wife's shopping trolley :roll: )

2006 BMW e61 535d m-sport :supafrisk: run's for cover :lol:

Doggy
Mod with a 2.2 HDi, De-Fapped!
Posts: 10318
Joined: Mon Oct 13, 2008 11:49 pm
Location: Northants

Re: Air bag fault / warning

Post by Doggy »

Had something similar with one of my bro's 406's which we managed to clear by unplugging / replugging the multi pin connector on the airbag ecu, which was under the centre console section in front of the handbrake. I think it was possible to access it without completely removing the plastic cover, but it's a while ago and I'm not sure.
2002 HDi 2.2 Exec Estate, (2008-12)
2003 HDi 2.2 6-speed Exec Estate (2012-19)
2009 Citroen C5 2.0 HDi VTR+ Estate

HDIESTATE
Newbie
Posts: 3
Joined: Wed Dec 11, 2019 1:29 pm

Re: Air bag fault / warning

Post by HDIESTATE »

Mine started doing this with the airbag and then the rest of the electrics went downhill fast. The standard waterlogged driver's footwell was soon found even though it looked fine from on top. The multiplex plugs are rotted through. Some of the wires are rotted off completely.
Does anyone have the locations for wire colours or numbers for the Blue connector? I only have Green to Orange and Orange to Grey left and a purple wire still located, the rest of the wires on the blue connector are floating free and would be guesswork.

HDIESTATE
Newbie
Posts: 3
Joined: Wed Dec 11, 2019 1:29 pm

Re: Air bag fault / warning

Post by HDIESTATE »

I have sorted out the wires and the airbag, fuel flap and countless other faults have gone. Mauve wire 1288 at the centre of the 5 pins of the blue 10 pin plug does not have a companion wire to go to but the hole in the connector looks pretty gross, as if it has had one in there. The is the piezo signal measurement wire so it is no surprise that the key symbol is lit and PP2000 cannot reset the keys. So it is back to the drawing board.So far I have not been able to find 1288 or IC11B 10V on any diagrams.

frog
2.0 Turbo
Posts: 270
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: Air bag fault / warning

Post by frog »

If you post me (via PM if you like your privacy) your VIN number i can look up some electrical schematics for you in SEDRE.
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.

frog
2.0 Turbo
Posts: 270
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: Air bag fault / warning

Post by frog »

Got your PM. This is what Service Box tells us:

Vehicle family: 406 (RESTYLING)
AS/RP N°: 09797 89 2 0182 ==> RPO Number is 9797
SILHOUETTE: 5 DOOR ESTATE
ENGINE: DW12TED4 TURBO DIESEL
TRANSMISSION: BVM5
ABS: WITH ABS BRAKES
DYNAMIC STABILITY CONTROL SYSTEM: WITHOUT ELECTRONIC STABILITY PROGRAM
DRIVING POSITION: RIGHT HAND DRIVE

I entered this data in SEDRE, but I cannot seem to find a 10-way connector in the footwell. I was able to find a "IC11B 16V BA": 16-way, color white?? Does the below diagram have any resemblance to your vehicle?
Component IC11C.jpg
Plodding along, I cannot find the diagram showing the which wires go into the "IC11B 16V BA" connector (if any...)

I found something by searching for "IC11B 10V" on this forum. This is the topic I found: http://406oc.co.uk/viewtopic.php?f=3&t=15593 . Maybe that helps?

I'm a bit in the dark here, I'm afraid :?
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.

frog
2.0 Turbo
Posts: 270
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: Air bag fault / warning

Post by frog »

Here is a diagram that shows IC11A, D and E:
Component CV00.jpg
Suddenly, IC11A has 16 pins?? (it had 6 pins in the previous diagram :? )

Anyway, seems like IC11D and E connect the air bag ECU (6570) with the COM2000 unit (CV00).

6565 is the "driver airbag module" (in the steering wheel).
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.

HDIESTATE
Newbie
Posts: 3
Joined: Wed Dec 11, 2019 1:29 pm

Re: Air bag fault / warning

Post by HDIESTATE »

Thanks for those Erik. The layout in my car is definitely only four connectors not five as shown in the diagram. The connector giving me trouble (because I seem to be a wire short) is definitely coloured blue and a 10V
The forum link you found is describing the exact connector I also have. I will be away from home for the rest of the week but will then continue with the puzzle.
I have hired a Mercedes diesel estate for the trip and comparing it to an elderly Peugeot 406, the Peugeot is so much nicer to drive.
Regards
Pieter

dirtydirtydiesel
3.0 24v
Posts: 1400
Joined: Sun Apr 28, 2013 11:02 pm
Location: Coalville, Leics.

Re: Air bag fault / warning

Post by dirtydirtydiesel »

Doggy wrote:
Tue Dec 10, 2019 11:50 am
Had something similar with one of my bro's 406's which we managed to clear by unplugging / replugging the multi pin connector on the airbag ecu, which was under the centre console section in front of the handbrake. I think it was possible to access it without completely removing the plastic cover, but it's a while ago and I'm not sure.

Hi Doggy,

Sorry for the very protracted reply :oops:

I've tried this today, as I'm in lockdown :roll:

Still the same original issue, nothing so far has fixed this.

Fingers crossed for footwell conectors or com's unit, only thing is I have zero other issue's unlike Hdi.
2002 110 HDi estate, Rapier in monaco blue! ( found quite a bit more power :cheesy: ) for sale
1999 3.0 V6 SE coupe in Diablo Red ( my baby ) sold
2006 206 1.4 16v sport in Aegean blue ( wife's shopping trolley :roll: )

2006 BMW e61 535d m-sport :supafrisk: run's for cover :lol:

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