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#1624964 - 13/09/2018 14:58 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
Skiday Offline
Club Member 1700
On a journey

Registered: 30/01/2008
Posts: 169
Loc: Isle of Wight,
Thanks Joe. That's the one. To save the problem of dead links for future readers of this, look in ebay for; "3 Pin to 16 Pin OBD2 Adapter Connector Diagnostic Cable Lead Wire for Fiat" Hope that helps others.
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20VT, Aston DBS, Ferrari F355

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#1624965 - 13/09/2018 15:34 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
Countrycruising Offline
Club Rep Europe, member 914
I AM a Coop

Registered: 12/09/2006
Posts: 14517
Loc: FCSS 01684 593187
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#1624974 - 14/09/2018 13:35 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
Skiday Offline
Club Member 1700
On a journey

Registered: 30/01/2008
Posts: 169
Loc: Isle of Wight,
With great relief I can now say my air bag system is reset and the light is out, and the MoT is done. But it was not from the cables and software recommended on this forum. After showing the garage the correct ecu port they were able to talk to the ecu with their machine, which is a 'Snap-On Modus Ultra' but with using leads from their previous diagnostic machine, a Solus Probe (the engineer thinks that the Solus Probe would have worked too, but cannot confirm that). This is great because I tried to download the trw2scan and was told a FTD2XX.dll file was missing and I thought "Here we go", round and round trying to get the software downloaded, but the garage phoned today and told me the good news. Perhaps the cables I have bought will be useful for other diagnostic work later.

So the conclusion, your local garage can reset your air bag if they have the right machine and know the correct ecu port to enter.

Remember, the light not going out is an MoT failure, so get it fixed or, If you're happy for the air bag to be disabled, remove the bulb remove before putting the car in for MoT (You can't take it out after an initial fail as the tester knows the air bag is not funtioning, if there is no light in the first instance then he can't know there is warning system at all).

Love and pace to all.
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20VT, Aston DBS, Ferrari F355

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#1624981 - 15/09/2018 10:06 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
Countrycruising Offline
Club Rep Europe, member 914
I AM a Coop

Registered: 12/09/2006
Posts: 14517
Loc: FCSS 01684 593187
Well done Andrew, the cables recommended would rest it but like yourself I use a more modern Modus unit with older cables.
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#1625035 - 17/09/2018 02:10 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
godders Offline
Club member 1575
On a journey

Registered: 16/05/2006
Posts: 144
Loc: Surrey Hills, U.K
Simply unplugging the connector from the Airbag ECU which is bolted to the transmission tunnel, behind the centre console, is far quicker than removing bulbs from the dash.

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#1625085 - 18/09/2018 13:29 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
Skiday Offline
Club Member 1700
On a journey

Registered: 30/01/2008
Posts: 169
Loc: Isle of Wight,
I did quite a bit of rooting around looking for the correct port but I didn't see the ecu itself (or if I did I didn't realise it), so if anyone has a photo of it that might be handy.

So now I have cables to tap into the ecu (not just the airbag ecu but also other systems I presume as all the ecu ports seem to be the same) what other uses might they come in useful for?

btw, the air-con is now working after some 5 years or so without it. Yipee! It only needed a new condensing rad and dryer! I had to turn it off on the way home from getting it charged as it was too cold!
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#1625119 - 19/09/2018 12:46 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 7006
Loc: Abu Dhabi, UAE
The airbag ECU is bolted to the central raised part of the floor underneath the heater / centre console. If you have "plus" carpet extensions, the ECU, cabling and diagnostic socket will be hidden. Otherwise, all that stuff is easy to locate when looking from the passenger foot well.

Just look for the cables with a yellow sleeve. This pic shows the cables/sleeve, and shows the paper label still attached referring to "EURO-BAG" (and "CRASH SENSOR" on the ECU) as a clue. Here's a clearer pic of the ECU and diagnostic socket (lower left, it plugs into a dummy connector attached to a metal bracket).
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#1625194 - 21/09/2018 09:53 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
Skiday Offline
Club Member 1700
On a journey

Registered: 30/01/2008
Posts: 169
Loc: Isle of Wight,
Thanks Dave thumb
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#1626256 - 23/10/2018 14:24 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
renault Offline
Club Member 1709
On a journey

Registered: 13/08/2007
Posts: 131
Loc: France
Downhillryder said
There appear to be four different airbag ECUs used on the Coupe. There was an early one from Becker. That is the one that has three wires to the diag socket and can be interrogated and reset by grounding one of the leads

well my car has a three wire socket so i would like to try to reset the light BUT - which of the three wires do I ground?
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#1626644 - 02/11/2018 15:44 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
renault Offline
Club Member 1709
On a journey

Registered: 13/08/2007
Posts: 131
Loc: France
well I am moving forward now - joined the club and got access to the manual and using the flashing codes of the air bag light I seethat I have three error codes :
4 blinks = wiring of module trigger circuits in contact with earth
6 blinks = resistance of passenger's module trigger device outside tolerance
7 blinks = supply voltage less than 9.5V.

Well I checked the voltage at the battery and get 13.5V. so that is a start. I suppose I now need to check the voltage at the fuse supplying the airbag control unit.
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#1626647 - 02/11/2018 16:59 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31912
Loc: Hemel in the Hempstead
I think one of the options is to reset the system. That would be a good place to start, since it will get rid of errors that have appeared in the past but are no longer present.
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#1626668 - 03/11/2018 13:05 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
renault Offline
Club Member 1709
On a journey

Registered: 13/08/2007
Posts: 131
Loc: France
a good idea barnacle - but how to do it?
p.s. if the fuse supplying the control unit is the one shown in my handbook ( just one of the general fuses in the box in the footwell) that is ok and giving around 13.5V.
Any advice on how to reset it would be most welcome please;
cheers
geoff
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#1626678 - 03/11/2018 21:29 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31912
Loc: Hemel in the Hempstead
According to the manual:

Originally Posted By Mr Fiat

After repairing the fault, repeat the test to make sure there are no other faults present. Bear in mind that the control unit communicates one fault at a time, until the system has been fully repaired. After completing the repairs, delete the memory by connecting the terminal no. 3 of the control unit for between 1 and 5 seconds. All the errors in memory must be deleted one at a time, repeating the procedure each time until the memory is deleted.


Which is not terribly clear, but I read as saying repeat the test multiple times until you get a single blink.


Edited by barnacle (03/11/2018 21:29)
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#1626751 - 06/11/2018 13:42 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
renault Offline
Club Member 1709
On a journey

Registered: 13/08/2007
Posts: 131
Loc: France
no, it is not clear at all :
"delete the memory by connecting the terminal no. 3 of the control unit for between 1 and 5 seconds"
connecting it to earth ? I can only assume so.
I am getting three errors - one of which is :
7 blinks = supply voltage less than 9.5V.
I would like to clear this one up first because I think it might be causing the other two errors.
I guess this is the supply voltage at the fuse. Can anyone confirm it this is the regunar fuse in the fusebox or if there is a separate one for the airbag control unit?
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#1626752 - 06/11/2018 13:56 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
GrahamL Offline
Forum is my job

Registered: 17/12/2005
Posts: 3563
Loc: Pothole City
The voltage error doesn't mean that the voltage is low right now, it means that at some point since errors were last cleared that the airbag ECU has seen a low voltage (maybe even just for a second) and as that may have caused a "brown out" fault or corruption of the ECU then it's flagged as an error.

Most likely your battery voltage got low at some point, but if it's OK now there's no point in checking fuses and voltages expecting to see a low reading.

Once the errors are cleared if you see the low voltage error again then you may want to replace your battery if the car is left standing without starting for a week or two. If the car is driven every day and you see the low voltage error appearing again then it would be time to start investigating the electrics for problems or a high current drain.

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#1626760 - 06/11/2018 18:53 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31912
Loc: Hemel in the Hempstead
I would agree with your assessment: connect it to earth (middle pin if I recollect correctly).

Each time you do it, it will flash out any stored errors. It will also clear those which are no longer active. So I'd take several attempts to read the errors and see if you get back to a no-error state. Or at least just one error to fix.
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Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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#1626796 - 08/11/2018 08:43 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
renault Offline
Club Member 1709
On a journey

Registered: 13/08/2007
Posts: 131
Loc: France
so, thanks Barnacle. We are moving forward. I have now reduced the fault codes down to one.
4 flashes = wiring of module trigger circuits in contact with earth.
Has anyone figured out what this could be ,
cheers
geoff
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Chez Dyna

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+33 (0) 468 69 91 19

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#1626809 - 08/11/2018 18:33 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31912
Loc: Hemel in the Hempstead
That sounds like a short circuit on the loom somewhere. The back of the radio is a common area for short circuits, and the wiring is probably going to be going somewhere in that area.

I *believe* that the 'module trigger circuits' are the drive signals that fire the airbags - either the passenger's above the glovebox, or the steering wheel.

Hmm, perhaps there's an issue with the clockspring in the steering wheel?
_________________________

Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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#1627069 - 18/11/2018 11:40 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
renault Offline
Club Member 1709
On a journey

Registered: 13/08/2007
Posts: 131
Loc: France
thanks for this Barnacle. sorry for the late reply. (Been to Uk and was very pleased to see the lovely display of Coupes at the NEC. Thanks to all involved. I know from my time with the Panhard club that it is very time consuming.)
Ref your first sentence, do you think I only need to restrict my search to the yellow sleeved part of the loom - or the whole loom in general?
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www.chezdyna.com

+33 (0) 468 69 91 19

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#1627087 - 18/11/2018 22:02 Re: Airbag reset with 2 wires for diagnostic? [Re: couper]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31912
Loc: Hemel in the Hempstead
It's been a few years since I've looked at the loom in that area, but *as far as I remember* all the airbag loom has yellow sleeves.
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Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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