AIR BAG permanently illuminated on the dash board

[C3CAR]

Can you let me know if I buy a passenger window does it have to be that particular year window the same as myn.

2002 to 2008 in June are the same front and rear door glass part numbers. After June 2008 the part numbers changed for front and rear door glass.

I don't know why.


It sounds like you have a C3 that has been well and truly got at before you took ownership.

Lol how easy is it to fit the Windows

I have not done a window, but there are some tips on removing the door panel which is how you would change the glass.

[00James00]

Yeah I think the same, gutted but life goes on, how much would it be worth scrap with the engine etc working well? Going to buy myself another one eventually but think I'm best selling this once I break into it lol

[00James00]

Hi, lucky enough I took some photos of my engine and can see the bonnet release cable, but just need some clarification that it is infact the release cable and should be accessible from underneath if I just pull it, I'v marked the location with a white circle

[00James00]

Right did a little research and might have found a way to get bonnet open and get some jump leads on, hopefully the Keyfob will then get central locking unlocked. I looked at photos posted that I have and yeah I think I do have pre tentioners in the car. In regards to airbag will test battery and alternator with the little multimeter that came but after that point I'm a bit stuck, would low voltage tend to mean from the battery or ecu as I know this regulates the voltage supply or am I wrong. Haha, if there was some kind of wiring problem then would the passenger airbag and also the pre tensioners not pop up on fault reading? I know that the pictures I put on indicates there a problem with the passenger airbag switch not being defined but when turning it off and on it works as it should including the warning LED going off and on when it should. If ecu regulates all the airbags then would passenger airbag also be affected by the low voltage. Mysterious creations these little cars are haha

[00James00]

Is the ECU configuration available through lexia? Is it the Electric Power steering ECU tab? As when first scanned it said no in the dialogue box or is it in BSI? Sorry for confusion and all these questions but as you can probably tell by the time I am a little persistent.

[00James00]

Will jump starting the battery cause any problems within the car, is there a way to do it that cannot cause damage? Just jump starting the battery then connecting there neg and poS?

[00James00]

Hi again!

I'v read that the airbag fault of voltage to low could be the regulator on the alternator. If so are these relatively easy to replace. Does anyone have any pics to show me how. Thank you

[C3CAR]

Hi again!

I'v read that the airbag fault of voltage to low could be the regulator on the alternator. If so are these relatively easy to replace. Does anyone have any pics to show me how. Thank you

Your long list of faults does look like there is a configuration issue rather than a single fault on the airbag system.

While a low voltage can cause faults to be recorded in the various ECUs, you should check the voltage from the alternator before changing the alternator. Its an easy test with a voltmeter or multimeter across the battery terminals with the engine running.

Will jump starting the battery cause any problems within the car, is there a way to do it that cannot cause damage? Just jump starting the battery then connecting there neg and poS?

Yes, it can. Don't jump start. You should charge the battery off the car and never jump start if you can avoid it.

Is the ECU configuration available through lexia?

There are several ECUs in the C3 and most of them can be configured in lexia.

Is it the Electric Power steering ECU tab?

This is the Electric Power Steering ECU, the ECU that controls the Power Steering motor, its not going to be related to the air bag system, but you may have a fault recorded for it.

If you have a C3 with lots of faults when connecting to lexia, the best thing to do is make a record of the faults by taking a screen shot of each one in turn, then you can go and delete each one in turn. Some will clear, some will (may) stay and some will (may) return after running the engine, using the brakes or driving some distance - depending on the fault.
With only the fresh codes, you can work on the remaining persistent or reoccurring codes.

As when first scanned it said no in the dialogue box or is it in BSI?

The BSI is the Body Control, it could be thought as the Master control where all the ECUs across the car can store faults and communicate with. You can find a lot of configuration of the various ECUs in the BSI, but each ECU can also be read.

Sorry for confusion and all these questions but as you can probably tell by the time I am a little persistent.

I am glad you have not given up with the C3. I would get the faults cleared, check the configuration one step at a time and see if you can clear up any faults as you go. Then you will have only faults left that are genuine faults and there may even be none.

These are some of the configuration options found in the BSI via lexia.

configuration options in the BSI from Lexia in the Citroen C3

Right did a little research and might have found a way to get bonnet open and get some jump leads on, hopefully the Keyfob will then get central locking unlocked. I looked at photos posted that I have and yeah I think I do have pre tentioners in the car. In regards to airbag will test battery and alternator with the little multimeter that came but after that point I'm a bit stuck, would low voltage tend to mean from the battery or ecu as I know this regulates the voltage supply or am I wrong. Haha, if there was some kind of wiring problem then would the passenger airbag and also the pre tensioners not pop up on fault reading? I know that the pictures I put on indicates there a problem with the passenger airbag switch not being defined but when turning it off and on it works as it should including the warning LED going off and on when it should. If ecu regulates all the airbags then would passenger airbag also be affected by the low voltage. Mysterious creations these little cars are haha

I would try to clear any of the air bag faults, then re-read the codes. Its easy to get caught up with codes that are no longer current - like the air bag switch one that gets generated as you switch it over.


Citroen C3 Central Locking not working
I see you found this tip. I agree, it could do with some extra information, or even a video of how the tip should be done

[Missing Lincs]

While a low voltage can cause faults to be recorded in the various ECUs, you should check the voltage from the alternator before changing the alternator. Its an easy test with a voltmeter or multimeter across the battery terminals with the engine running

I would stress the importance of checking the battery and alternator voltages. I had a case of poor voltage regulation triggering a long list of faults on another make of car. Voltage might not be your problem but checking you have a good solid electrical supply is fundamental to getting accurate results from everything else you do.

Voltage checks should be carried out when the battery is fully charged, if it's run down you won't get proper readings of the battery itself or the voltage generated by the alternator.

I suggest using a moving coil multimeter for checking car systems - the sort with a needle pointer on a scale. Digital multimeters don't sample fast enough to see fluctuations superimposed on the dc voltage. With a moving coil meter used to check the alternator voltage you can often see a ripple voltage as a 'vibtration' of the needle. It is possible to use a digital meter set to AC voltage to check for ripple but it's unlikely you will get much clue from the readings.

[C3driver52]

While a low voltage can cause faults to be recorded in the various ECUs, you should check the voltage from the alternator before changing the alternator. Its an easy test with a voltmeter or multimeter across the battery terminals with the engine running

I would stress the importance of checking the battery and alternator voltages. I had a case of poor voltage regulation triggering a long list of faults on another make of car. Voltage might not be your problem but checking you have a good solid electrical supply is fundamental to getting accurate results from everything else you do.

Voltage checks should be carried out when the battery is fully charged, if it's run down you won't get proper readings of the battery itself or the voltage generated by the alternator.

I suggest using a moving coil multimeter for checking car systems - the sort with a needle pointer on a scale. Digital multimeters don't sample fast enough to see fluctuations superimposed on the dc voltage. With a moving coil meter used to check the alternator voltage you can often see a ripple voltage as a 'vibtration' of the needle. It is possible to use a digital meter set to AC voltage to check for ripple but it's unlikely you will get much clue from the readings.

Great advice Missing Lincs

This is an analogue style multimeter with a moving coil that will do the job of measuring the alternator output and check for an AC component of the DC output. You can pick them up cheaply here on eBay new.

cheap multimeter to look for alternator faults