Technical Air Bag warning light & connectors

[Deckchair5]

re: Air Bag warning light & connectors

Disconnect the switch connectors and treat with the same contact cleaner as you did on the underseat connectors

 

[Morty Mort]

re: Air Bag warning light & connectors

I think there are a couple of connectors in the B pillar. When I was making my sub install I noticed connection blocks in the lower part of the pillar, behing the trim there. They are difficult to get access, to as it seems like this trim / cover only slides downwards and stops in the seat rails. So the seat needs to be removed completely.

My OCS has gone, and is confirmed by the Fiat Examiner. I knew it anyway because if noone was sitting in the passenger seat, and the alarm did not go off, I had (and still have) just to lay my hand on the seat and it went bananas again, after orange flashing on the dash.

But I have noticed something strange... I do not have orange connectors on the front seat? They seem to be missing. Does this mean I've got no airbags there? I didn't think that was an option


Morten.

 

[ioannidis]

re: Air Bag warning light & connectors

Propably they are changed... Are you the first owner of the car?

 

[kevhky]

re: Air Bag warning light & connectors

Cheers for the help/advice, when i get home on Friday ill have another check inc the on/off switch, Thanks for your help / advice

Ill keep you all posted

Kev

 

[Morty Mort]

re: Air Bag warning light & connectors

Propably they are changed... Are you the first owner of the car?

No, the second. An elderly man had taken care of it the first years. I bought it from the dealer though. There is one large black connection block, which says seat heater or something, can't recall right now, and there is the grey OCS block - which is faulty. Both seats have tags on their back which says "airbag".

Do you know what the new wiring loom should look like?

Morten.

 

[stec]

re: Air Bag warning light & connectors

this to emulate the sensor ocs???????, that seems to them

 

[stec]

re: Air Bag warning light & connectors

Example Emulator Ocs Here

 

[kevhky]

re: Air Bag warning light & connectors

Hi

Deckchair - ive noe removed the on/off switch sprayed it and still the annoying beep beep airbag failure stop engine.

It must be the ocs, but how can i check it before handing over my dosh at the dealers, rather do it myself but need to know for definate befor i buy one.

Any further info would be great

Thanks

Kev

 

[v12ock]

re: Air Bag warning light & connectors

also i think for stilo there is an airbag exclusion switch under seat as the fault occurs on most stilos, part is bout £3 i think and a dealer would charge btwn 1/2 hour to an hour labour to fit, diag at fiat will discover errors

 

[kevhky]

re: Air Bag warning light & connectors

also i think for stilo there is an airbag exclusion switch under seat as the fault occurs on most stilos, part is bout £3 i think and a dealer would charge btwn 1/2 hour to an hour labour to fit, diag at fiat will discover errors

Is it possible to fit this switch myself if its available, do you have part number

Regards

Kev

 

[Deckchair5]

re: Air Bag warning light & connectors

Ok there are some further checks you can do on the OCS

The yellow flashing light on the dash should flash a few times on start up and then hardly anything which shows the OCS is doing it's checks. Yours may be going straight to WARNING AIRBAG FAILURE though

Take a look at the OCS connector, the grey one under the passenger seat
3 wires going in
Black is earth so check that with a multi meter for near zero resistance to earth maybe on one of the seat anchor bolts

Blue/yellow is battery voltage supply so check for 12v or more

Last wire Grey/white is the signal return from the OCS and should be producing 10-11.5v compared to earth when still connected so you'll need to back probe the connector (See Stilo Guides for how to check electrical circuits)

 

[kevhky]

re: Air Bag warning light & connectors

Ok there are some further checks you can do on the OCS

The yellow flashing light on the dash should flash a few times on start up and then hardly anything which shows the OCS is doing it's checks. Yours may be going straight to WARNING AIRBAG FAILURE though

Take a look at the OCS connector, the grey one under the passenger seat
3 wires going in
Black is earth so check that with a multi meter for near zero resistance to earth maybe on one of the seat anchor bolts

Blue/yellow is battery voltage supply so check for 12v or more

Last wire Grey/white is the signal return from the OCS and should be producing 10-11.5v compared to earth when still connected so you'll need to back probe the connector (See Stilo Guides for how to check electrical circuits)

The yellow flashing light on the dash should flash a few times on start up and then hardly anything which shows the OCS is doing it's checks. Yours may be going straight to WARNING AIRBAG FAILURE though

Yes mine comes on red goes off for around 2 seconds then back on red and the useual beep beep turn off engine

Ill read the guide before i test wires as beginner in this field

Deckchaire - have you heard of the switch which was mentioned earlier to turn air bag off, its the first ive heard of it

Regards

Kev

 

[Deckchair5]

re: Air Bag warning light & connectors

It's not a big problem but you need to check the voltages with the connector still connected and back probing (sticking something like a pin in the back of the connector wires) enables you to do this

There's only the one front passenger airbag disable switch which you looked at recently. You might have a rear passenger disable switch depending on your options

Don't forget to check the fuse, you'd kick yourself if that was the problem

 

[kevhky]

re: Air Bag warning light & connectors

Hi

Just took a look at the grey connector, three wires are Red, White and Brown not the same colours as you mentioned bud

Results

Red - 12v
White - 11v
Brown - 0.05v

Anthing else i can check

Thanks

Kev

 

[kevhky]

re: Air Bag warning light & connectors

Don't forget to check the fuse, you'd kick yourself if that was the problem

I checked it with a fuse tester but im going to change it to be on the safe side (cant see it being this) and yes id more than kick myself

Just double checking am i right in saying theres only one fuse for this in the fusebox drivers fusebox

Results

Red - 12v
White - 11v
Brown - 0.05v

kev

 

[Deckchair5]

re: Air Bag warning light & connectors

Ah they like changing wiring colours just to keep us guessing

There's just the one fuse F50 for the OCS and airbag ECU and it would stop power to the airbag ecu and fire off the warning. It also feeds the OCS so the fact you have 12v arriving there then the fuse and its contacts are ok

NB Fuse F37 also feeds the engine ECU and is in the airbag circuit

Worth noting that the steering wheel clockspring is part of the circuit, as are the seat belt pretensioners. So it could be quite a few other items besides the OCS, I think once you've done the more normal villains of the underseat connectors, the front airbag and the rear airbag connectors then it's time to have an airbag fault diagnosis to pinpoint the problem ( we hope)

Definitely don't buy an OCS and hope it's that. It appears to be kicking out the right voltages so the problem may well be somewhere else in the system or even the airbag ecu itself.

You don't have rear airbags do you?

 

[LeeStilo]

re: Air Bag warning light & connectors

how do you open the latch under the seats? ive just had the stop engine warning after moving my seats and im useless at anything technical, ive looked at the guide but dont wanna start messing really? but if i cn get to them easily enough id give it a go as its annoying! is it just under each seat or am i checking in the boot and in the glovebox to? thanks

 

[kevhky]

re: Air Bag warning light & connectors

how do you open the latch under the seats? ive just had the stop engine warning after moving my seats and im useless at anything technical, ive looked at the guide but dont wanna start messing really? but if i cn get to them easily enough id give it a go as its annoying! is it just under each seat or am i checking in the boot and in the glovebox to? thanks

Open the latch = very very easy bud, get down so you can see and lift it from the back moving it towards you, its resting/clipped into a catch type thing, yes they are under each seat, once youve unclipped one the other will be a doddle

Regards

Kev

 

[kevhky]

re: Air Bag warning light & connectors

Ah they like changing wiring colours just to keep us guessing

There's just the one fuse F50 for the OCS and airbag ECU and it would stop power to the airbag ecu and fire off the warning. It also feeds the OCS so the fact you have 12v arriving there then the fuse and its contacts are ok

NB Fuse F37 also feeds the engine ECU and is in the airbag circuit

Worth noting that the steering wheel clockspring is part of the circuit, as are the seat belt pretensioners. So it could be quite a few other items besides the OCS, I think once you've done the more normal villains of the underseat connectors, the front airbag and the rear airbag connectors then it's time to have an airbag fault diagnosis to pinpoint the problem ( we hope)

Definitely don't buy an OCS and hope it's that. It appears to be kicking out the right voltages so the problem may well be somewhere else in the system or even the airbag ecu itself.

You don't have rear airbags do you?

Deckchair ive tried removing the fuse F50 and guess what bud it still beep beep turn off the engine (bloody annoying)

Im gonna give up on this one as ive tried everything as far as i can so its off to the dealers i go

Thanks very much for you excellant knowledge in this and hopefully it will help others with this stilo issue arrising all the time

Regards

Kev

 

[T14086]

re: Air Bag warning light & connectors

also i think for stilo there is an airbag exclusion switch under seat as the fault occurs on most stilos, part is bout £3 i think and a dealer would charge btwn 1/2 hour to an hour labour to fit, diag at fiat will discover errors

switch under the seat