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Old 20-06-2018   #1
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Punto evo airbag light on.

Hi guys,the Airbag light came on on my wife's punto evo last week and a message on the dashboard flashes up airbag failure,I took it to my friends garage,he does not specialise in fiat but ran a diagnosis scan and the code says airbag power supply failure,which he suggested may be a blown fuse,with this in mind I remember fiat troubles with chaffed wires in the rear hatch ,I pulled back the rubber boot and sure enough two high current wires and a thin black wire had bare wire showing,I assume the two thick black wires are for the heated rear screen,it it possible this may be something to do with the airbag failure ?? My friend has identified a fuse I need to check but not got round to it yet,got to get it sorted soon though as the mot is in a couple of weeks.
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Old 21-06-2018   #2
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Re: Punto evo airbag light on.

Quiet on here..

May well be same in the GP
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Old 21-06-2018   #3
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Re: Punto evo airbag light on.

I wasn't building my hopes up as the air bag electronic systems all seem to be some closely guarded secret .
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Old 22-06-2018   #4
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Re: Punto evo airbag light on.

Ok so need some real help now from a electronic diagnostic expert,my friend identified A fuse I need to check under the dashboard in the glove box,when I opened the glove box I noticed the light did not come on ,so I pulled the fuse he said could be the air bag control power supply but it tested ok,however as soon as I put it back in the glovebox light came back on,so I was very excited thinking the air bag control must share the same common power supply ,now the Haynes manual says any airbag codes are not self resetting and must be reset with a scanner so I borrowed my friends snap-on ethos+ scanner but as soon as I reset the airbag code it comes back on again,the code displaying is B0101 Airbag control unit power supply ,can any one help as the Mot is looming , many thanks in advance.
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Old 23-06-2018   #5
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Re: Punto evo airbag light on.

Ok so we don't have any electronic diagnostic members here,can any one recommend​ a place that could test me the air bag ecu ?
I have played around with my friends scanner and I have concluded it's most probley bad data in the airbag ecu , corruption more than likely caused by the fact the battery's getting a bit tired and I should have changed it long ago !!
The live data on the scanner reports several systems not responding,both front impact sensors absent seat belt fastened absent ,seat occupancy sensors not responding,as a test I took the car for a 30 mph blast down the road with no seatbelts on and a front seat passenger and no alarms go off, so this seems to indicate the scanner is correct,however all the air bags are responding apart from driver side stage two so I don't think the ECU has lost its power source at all.
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Old 23-06-2018   #6
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Quote Originally Posted by Michael Dranfield View Post
Ok so we don't have any electronic diagnostic members here,can any one recommend​ a place that could test me the air bag ecu ?
I have played around with my friends scanner and I have concluded it's most probley bad data in the airbag ecu , corruption more than likely caused by the fact the battery's getting a bit tired and I should have changed it long ago !!
The live data on the scanner reports several systems not responding,both front impact sensors absent seat belt fastened absent ,seat occupancy sensors not responding,as a test I took the car for a 30 mph blast down the road with no seatbelts on and a front seat passenger and no alarms go off, so this seems to indicate the scanner is correct,however all the air bags are responding apart from driver side stage two so I don't think the ECU has lost its power source at all.
Hi. You are far better qualified than me..

But we have a few who tend to post informative info.

@g8rpi
Being a prime example

Unfortunately the evo and 2012 sections are mega quiet..

Charlie
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Old 23-06-2018   #7
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Re: Punto evo airbag light on.

Quote Originally Posted by Michael Dranfield View Post
Ok so need some real help now from a electronic diagnostic expert,my friend identified A fuse I need to check under the dashboard in the glove box,when I opened the glove box I noticed the light did not come on ,so I pulled the fuse he said could be the air bag control power supply but it tested ok,however as soon as I put it back in the glovebox light came back on,so I was very excited thinking the air bag control must share the same common power supply ,now the Haynes manual says any airbag codes are not self resetting and must be reset with a scanner so I borrowed my friends snap-on ethos+ scanner but as soon as I reset the airbag code it comes back on again,the code displaying is B0101 Airbag control unit power supply ,can any one help as the Mot is looming , many thanks in advance.

Hi,
I did not see your original post, not Punto owner so omly pick up what shows in "new posts"
This needs some basic fault finding. First thing is to ensure all supplies and grounds are present at the Airbag ECU. It's not unusual for airbag ECUs to have multiple supplies for redundancy. To check the supplies you need the wiring diagrams (schematics) from eLearn or autodata. Don't seem to have much in the downloads section for the EVO. I' like to help but am pretty far away from you (Cambridgeshire) . It's hard to do much remotely, and it depends on your skill level. Do you have a multimeter and how confident are you using it?


Robert G8RPI.
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Old 23-06-2018   #8
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Re: Punto evo airbag light on.

Got a 650 fluke DMM and Real time digital storage scope but not a lot of use without a circuit diagram,nothing relating to airbag ecu in the Haynes manual,I have just had a look on the net and it looks like the serial eeprom may be corrupted and just needs reprogramming but I can't find a bin file either.
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Old 24-06-2018   #9
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Re: Punto evo airbag light on.

Quote Originally Posted by Michael Dranfield View Post
Got a 650 fluke DMM and Real time digital storage scope but not a lot of use without a circuit diagram,nothing relating to airbag ecu in the Haynes manual,I have just had a look on the net and it looks like the serial eeprom may be corrupted and just needs reprogramming but I can't find a bin file either.

Hi,
Basics first. From a quick look I could not find a copy of eLearn for the evo on ebay but thre is one for the GP https://www.ebay.co.uk/itm/FIAT-GRAN...Y/132180872193
You might find an evo one on ebay.it A GP diagram would at least give pin connections. but cheeck what airbags fitted Should be Continental but some have TRW. Multiecuscan www.multiecuscan.net and an el inteface + adaptors would be a good investment too.


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Old 24-06-2018   #10
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Re: Punto evo airbag light on.

Snap on scanner says contenental ECU is fitted but unfortunately I think we're stuffed with this one Robert,I contacted a couple of people who say they can repair airbag systems but when I told them it was a punto evo they both said the same thing,this type can't be repaired and it is also coded to the vin number of the chassis so no point in even buying a second hand one,and with the mot been only 6 days away looks like I will have to take out a second mortgage and go to a fiat main dealer,but thanks for your help anyway.
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Old 24-06-2018   #11
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Re: Punto evo airbag light on.

A decent fiat:alfa indy should have access to the same kit..

And potentially better versed in its use. Charlie
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Last edited by varesecrazy; 24-06-2018 at 15:25.
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Old 24-06-2018   #12
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Re: Punto evo airbag light on.

Problem is the mot is due in 6 days time and the last thing I need is main dealer picking up on this and saying you need to let us do the mot or you can't drive it away because I know it also needs 4 new tyres which I can get for 50 each.Going to try the two nearest main dealers in the morning and see if they will tell me over the phone how much they will charge to have a look and give an estimate for repairs .
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Old 24-06-2018   #13
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Re: Punto evo airbag light on.

Quote Originally Posted by Michael Dranfield View Post
Snap on scanner says contenental ECU is fitted but unfortunately I think we're stuffed with this one Robert,I contacted a couple of people who say they can repair airbag systems but when I told them it was a punto evo they both said the same thing,this type can't be repaired and it is also coded to the vin number of the chassis so no point in even buying a second hand one,and with the mot been only 6 days away looks like I will have to take out a second mortgage and go to a fiat main dealer,but thanks for your help anyway.

Well a main dealer will just change the ECU and you will have to pay even if it's not faulty. The eLearn linked to is only 7 and electronic delivery. I'd still want to check power and grounds before buying an ECU.
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Old 25-06-2018   #14
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Re: Punto evo airbag light on.

Well rang the main stealerhip today,89.99 to tell me what I already know,however this prompted me to have another look tonight but the more I look the more nothing makes any sense so I wonder how if it is only needs a software update ???
Scanner shows multiple errors ,taking just one as an example it says the front seat belt stalks are working o.k ,however the car thinks otherwise,when I turn the ignition key after a few seconds the seat belt locked light goes out even though the seat belts are not clipped in at all .I have checked both stalks and the microswitches do toggle between zero ohms and infinity when the seat belts are clipped in or out so clearly the snap on scanner is right but the car is wrong.
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Old 25-06-2018   #15
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Re: Punto evo airbag light on.

Quote Originally Posted by g8rpi View Post
Well a main dealer will just change the ECU and you will have to pay even if it's not faulty. The eLearn linked to is only 7 and electronic delivery. I'd still want to check power and grounds before buying an ECU.
Many thanks Robert but I don't think e learn for the grand punto will help with the evo because I have a Grande punto as well and I have made some comparison checks between the two cars ,on the Grande the seatbelt stalks micro switch are normally open but on the evo they are normally closed.
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