Airbag ECU Failure etc

[Tigger-Tim]

Mine failed at 14.6 Very High Voltage !!
Crash Data report :-
View attachment 566718

I've just checked my (2021 model with stop/start), and the charge voltage seems to peak at 14.9v.

 

[Riverbankannie]

I've just checked my (2021 model with stop/start), and the charge voltage seems to peak at 14.9v.

Ours is a 2015 model, my husband thinks that 14.6 should not kill the unit. I think it is possible that I tried to start the engine before allowing sufficient time for the dashboard lights to go out and this could have done it as it was in the middle of a drive when we had stopped at a supermarket.

 

[Tigger-Tim]

>> Ours is a 2015 model, my husband thinks that 14.6 should not kill the unit.

I'd agree with him.

 

[Phill D]

Ours is a 2015 model, my husband thinks that 14.6 should not kill the unit. I think it is possible that I tried to start the engine before allowing sufficient time for the dashboard lights to go out and this could have done it as it was in the middle of a drive when we had stopped at a supermarket.

I believe this to be one of the potential causes, my theory being, a sudden change in electrical state while the ecu is in the process of booting up.
but i have no way of proving that.

 

[Richard n Ann]

They aren't worth the faff and cost.
When ours fails I'll be fixing ours with one of these 10p devices and a timer

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[MR. FUSION]

They aren't worth the faff and cost.
When ours fails I'll be fixing ours with one of these 10p devices and a timer

View attachment 568458

Where does the timer go & what does it look like ?

 

[Petew]

I’m also interested in the 10p device and timer.
I’ve got a problem with my air bag warning light at the moment, it may save me a trip to my local garage.

 

[Lenny HB]

I've just checked my (2021 model with stop/start), and the charge voltage seems to peak at 14.9v.

I don't think think there are any problems with later vans.

 

[MR. FUSION]

I’m also interested in the 10p device and timer.
I’ve got a problem with my air bag warning light at the moment, it may save me a trip to my local garage.

Probably a good idea of you have an A class like this, where the occupants appear to be the filling for the dashboard & Air bag/seat sandwich

 

[Richard n Ann]

I’m also interested in the 10p device and timer.
I’ve got a problem with my air bag warning light at the moment, it may save me a trip to my local garage.

Just look on ebay for "airbag LED timer" there are little modules for sale that will sort the MOT problem for about a fiver.

You might need to buy the LED if it doesn't come with it, there are various colours of 3mm and 5mm LEDs available, install it into the instrument panel behind the ABS diffuser, it might need a resistor in line like 6.2k ohm ¼ watt

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[Diabalo]

Do we know if the airbag still works with the light problem? If not why are people faffing about with led and timers, surley the saftey of driver and passenger is paramount.

 

[dunnah01]

Has anybody tried to resolve the airbag light problem using Multiecuscn?

 

[Phill D]

Do we know if the airbag still works with the light problem? If not why are people faffing about with led and timers, surley the saftey of driver and passenger is paramount.

No it is disarmed if the ecu see a circuit problem.

 

[Phill D]

Has anybody tried to resolve the airbag light problem using Multiecuscn?

There is no way to repair the ecu as far as I can tell.
You can reset it but if its dead then it has to come out as far as I know.
But there are a few members who are more proficient with Multiecuscan than I.

 

[Riverbankannie]

No it is disarmed if the ecu see a circuit problem.

One might expect the light to come on in red for danger do not drive, rather than orange for warning.

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[Phill D]

One might expect the light to come on in red for danger do not drive, rather than orange for warning.

When mine went it was orange both on passenger airbag and drivers airbag. Also the menu showed passenger bag dissarmed.
But you are correct some lights go red when total failure or major fault

 

[MR. FUSION]

There is no way to repair the ecu as far as I can tell.
You can reset it but if its dead then it has to come out as far as I know.
But there are a few members who are more proficient with Multiecuscan than I.

At least with a reader you can tell, I managed to reset mine with an occasional drivers seatbelt pretensioner fault for 18 months before it fully died with the code I posted. The drivers pretensioner fault may be real, but at least with a new unit I can be more certain.

 

[SpeedyDux]

When mine went it was orange both on passenger airbag and drivers airbag. Also the menu showed passenger bag dissarmed.
But you are correct some lights go red when total failure or major fault

I had the passenger airbag telltale light go orange as well but a few journeys later it stopped and only the red airbag warning light showed.

I suspect ECU failure could also disarm the seat belt tensioners. Fully tightening the seat belts before setting off might be a wise precaution.

I did read on a FIAT forum that the ECU software failure can result in the passenger airbag but not driver airbag being deployed in a crash, but I don't know whether to believe that or not.

 

[MR. FUSION]

One might expect the light to come on in red for danger do not drive, rather than orange for warning.

I have an orange light, but according to Crashdata my ECU is giving a code that it is dead & no longer operational.

 

[zedman]

how long do they last when they come back from crash data after being reset ?

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[Riverbankannie]

I have an orange light, but according to Crashdata my ECU is giving a code that it is dead & no longer operational.

Yes, I think we all have had an orange light when it fails, however I did continue to drive it whist waiting for repair because the light was orange.

 

[Riverbankannie]

how long do they last when they come back from crash data after being reset ?

Mine has been ok since, about 14 months now.

 

[Stumpie]

Morning, my 2019 Citroen Wildax was at the garage yesterday they say it needs a new ECU as the airbag alarm goes on and off intermittently.lights flash depending on the season and so does mileage. We have two batteries and kept on hook up.
I’m hoping it can get replaced under warranty

 

[Phill D]

Morning, my 2019 Citroen Wildax was at the garage yesterday they say it needs a new ECU as the airbag alarm goes on and off intermittently.lights flash depending on the season and so does mileage. We have two batteries and kept on hook up.
I’m hoping it can get replaced under warranty

Odometer flashing is usually a canbus fault which can be a communication issue with the ecu

 

[Diabalo]

There is a secondary issue with the dashboard binnacle where odd things start happening with the LED's and needles, mine has been sent away twice, once for the LED comming on for no reason and the little screen went awol so had to have another one of those fitted also.

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[dle54]

Found this a fascinating thread. I’ve just replaced my airbag ecu on my 2014 fiat Ducato battery fully charged and healthy, no issues but ecu dead, replaced but I will listen to the warnings. Crash data were most helpful to my garage and no I have no interest in that company but I say what I find.
Nadolig Llawen a Blwyddyn Newydd Dda

 

[Alan Atkin]

Same on Peugeot Boxer or the Citroen, the unit on my Peugeot was a Fiat one.

have a marquise 175 peugeot had the same problem in the end took it to peugeot garage diagnosed new ecu but new guidelines were to also fit an extra earth wire no trouble after for 3.5k miles no change from £590 have the old ecu ind electrician said it could have been repaired and reprogrammed for a lot less.happy christmas and a good new year to all

 

[Larby]

how long do they last when they come back from crash data after being reset ?

Mine failed. Had it repaired. Fully charged battery and took for MOT. Went to use a month later and failed again. Crash Data said it worked when I got it back from them so would need to go back and pay again as they did their bit, true I suppose

 

[Lenny HB]

Morning, my 2019 Citroen Wildax was at the garage yesterday they say it needs a new ECU as the airbag alarm goes on and off intermittently.lights flash depending on the season and so does mileage. We have two batteries and kept on hook up.
I’m hoping it can get replaced under warranty

I thought they had cured the problem by then, obviously not.

 

[zedman]

I thought they had cured the problem by then, obviously not.

what Actually is the problem ?????

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