Air bag fault / warning

[Wul]

Thanks for the offer frog,

Re - the vist you, the car's not legal due to the MOT expiring last December 2019
I can't get it through an MOT with this airbag problem.

But I ain't giving up yet

When looking at this wiring diagram from Autodata, it seems that Data Link Connector (OBD) is connecting to the airbag module through the BSI. Since you had tried to replace the airbag module and PP2000 still can't communicate to it, maybe the problem lies within the BSI.

[Wul]

Sorry since I can't edit my post again, it seems A11-I in that diagram refers to the module in the engine bay (I think it's called BM34? I'm not too familiar with full mux system) instead of BSI under the steering column.

[Wul]

Well, it seems my first post is the correct one. Airbag module connect to BSI under the steering column.

Sorry for triple posting

[dirtydirtydiesel]

Hey
Thanks for the advice Wul.
We have tried a cloned BSi with no luck, I'm not paying out for a new one.
I plan on having a proper look at this when the day's get longer.

[dirtydirtydiesel]

http://www.petrila.net/repair/index.htm

Usually works for me. Has a full-mux diagrams with wire numbers etc.

(You want section 60 "Protections, Openings etc.")

Hi Doggy,

Hope you're well?

The link you put above, if I open it I can't understand it.
Do you know how to get it in English?

Cheers DDD.

[Doggy]

Hi DDD, I'm fine thanks hope you are too.

Unfortunately that link hasn't worked for a year or two and I haven't found a replacement.

[dirtydirtydiesel]

Thanks anyway Doggy, worth an ask

Yeah I'm good thanks except for the obvious

I'll keep trying for now, thanks for the quick reply

[dirtydirtydiesel]

Right all.

I can finally bring this saga to a conclusion & hopefully help out future 406 owner's

Only took me three years off & on but she's fixed

Turns out that the 'new unused' airbag ECU I bought was as duff as my original, this lead me up the wrong path believing that the airbag ECU was good & my fault lay elsewhere. Hence my struggles for over the last two years

The guy who is buying my car has a much worse condition 406 that we tried my two airbag ECU's in (& they threw up the same fault as in mine)

So we tried his in my car &
All the lights test & then go out
HAPPY DAYS

So what caused the original issue, having had a read up on airbag ECU faults it's more common than you would think.
If the battery goes low (due to standing) when you go to start it. If you don't wait for the airbag circuit test & the lights to go out.
It can cause a spike upon startup & this blows the capacitors in the airbag ECU

So there you go another one saved to go on for years more service (after all the work I've done to her)

Thanks for all who have tried & offered to help throughout this saga Doggy & frog to name a few

Cheers for now DDD.

[Doggy]

To any Mod's still out there that have the ability
to edit / remove posts.
My last three post's (not including this one) if you read them are slightly duplicated.
Only the last one wants to stay, if you could remove the two before it (if you catch my drift) & this one.

Also you can now edit the title (I tried ) to add
NOW FIXED!!!

Many thanks DDD.

All done. I'll remove this one in a day or two.

Good work sorting it out & posting the results.

[frog]

Congratulations! Well done! You did not give up

It can cause a spike upon startup & this blows the capacitors in the airbag ECU

Any chance that could be repaired by replacing the blown capacitor?

[dirtydirtydiesel]

Thanks frog

Told you I'd keep at it, if you saw the car in the flesh you'd understand.
When the new owner first saw it he said quote (ah man, you can't break it for spares it's too nice)

I can't believe all my struggles have been due to being sold a 'new in the box, dud '

If that had worked back in March 2020, we would never have been in touch

Yes, they can be repaired in the UK for £55.
But now we have a good one in it & you can buy used for £20 ish so if we need another we'll go down that route.
After all it's a power spike that caused the issue, not wear & tear

Hope you & your family are well

Take care my friend & thank you for all your help

[frog]

Take care my friend & thank you for all your help

You're welcome But in the end, all the schematics I gave you were pretty useless as it turned out the box itself was broken.

Hope you & your family are well

Thanks, we're doing fine. Kids are growing older (and so are my wife and I...) Worried for the day the kids are all having their own car (but dad can repair )