Citroen Picasso B78 Lexia needed.. Airbag light

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Itchigo55
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Citroen Picasso B78 Lexia needed.. Airbag light

Post by Itchigo55 »

Hi guys, first ever Citroen, well first ever french car tbh. I really like it, everything works except the airbag light is on the dash and the airbag pretensioner warning has come on, I need this diagnosed for the warranty company but worried they won't pay out and I'll be left short paying £100s for the diagnosis. Has anyone got a Lexia I could scrounge use of around Surrey?
Thanks all.
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GiveMeABreak
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by GiveMeABreak »

Unfortunately you'll find that unless they can find a fault after the diagnosis they probably won't cover the diagnostic charges. With Airbag lights these can be intermittent - especially if linked to the wiring under the carpet (which is a common cause of these issues). Whatever happens you will need to get it sorted one way or another as it will likely be an MOT rejection if the Airbag warning lights does not extinguish.

A dealer level diagnostic should be no more than £90 for an hour - but they should do half hour slots. It won't take them long to do a Global test and check for the fault codes. Of course, there are some members here that may be able to help. Check the Lexia owners list and specifically the map at the end of the list for member locations highlighted on a Google Map:

viewtopic.php?f=19&t=56452
Itchigo55
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Itchigo55 »

Thanks that's a real help. I've checked under the seats but can't see anything obviously disconnected, is it safe to unplug the connections while the battery is connected or do I risk setting off airbags?
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Hell Razor5543
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Hell Razor5543 »

NEVER disconnect/reconnect the airbag connectors when the battery is connected. It is possible that an uncontrolled power spike could set one off. There is a procedure for disconnecting/reconnecting the battery (that will allow the ECUs to go through a clean shut down/start up procedure. Only work on the airbag systems when you have completed the battery disconnection procedure (the following link covers this procedure, but, as it is for a C5, will have steps that you can ignore, related to the suspension).

viewtopic.php?f=51&t=61997

I feel certain that, if there is anything missing in the procedure, a Moderator will update this thread.
Last edited by GiveMeABreak on 21 Jun 2019, 15:57, edited 1 time in total.
Reason: Updated Link to Procedure in Diagnostic Section
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by GiveMeABreak »

Itchigo55 wrote:
21 Jun 2019, 14:43
Thanks that's a real help. I've checked under the seats but can't see anything obviously disconnected, is it safe to unplug the connections while the battery is connected or do I risk setting off airbags?
Before you do anything, regarding the airbags, use my battery disconnection procedure here:

BSI Reset / Battery Disconnect / Reconnect Procedure

Follow the forst part for disconnection - then allow 10 minutes for the Airbag ECU power reserve to dissipate. Then you can do some checking - but don't use a multimeter on any of the connections. Just do a visual check for kinks, splits / shorts and check the plugs are tight and that the pins in the plugs are visible from the connectors to ensure one hasn't come loose.

When you are done, follow the procedure from the reconnection part to make sure the ECUs are restarted correctly.

It will be better once you have a diagnostic - so maybe better to hang on until then as it may be pointing to another issue. :)
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Itchigo55 »

Thanks guys, great replies and knowledge on this forum.

I've looked down the Lexia list of all those close to me but unfortunately most haven't been online since 2016! D'oh!
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Hell Razor5543 »

Dating back to my days when I used to help manufacture circuit boards (the boards themselves, prior to being populated with components) I have a very simple attitude to anything that may be dangerous (and, at that time, I was handling toxic/corrosive chemicals); If you don't know if something is dangerous treat it as if it is. Airbags (and pre-tensioners) use an explosive charge to deploy them in the timescales needed. I know that they go off HARD, as I was involved, several years ago, in an accident where the drivers' airbag deployed. Mum was driving, and it damned near broke her nose (it took her sinuses over a year to recover). However, while it hurt, she said it was far more preferable to either slamming her face into the steering wheel or suffering whiplash.
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by GiveMeABreak »

Itchigo55 wrote:
21 Jun 2019, 16:28
Thanks guys, great replies and knowledge on this forum.

I've looked down the Lexia list of all those close to me but unfortunately most haven't been online since 2016! D'oh!
Yes, not all members are active here all the time. You might get away with a generic OBD II code reader - but some of these are not advanced enough to talk to the ECUs in newer cars and can only supply generic basic info. It might me worth a punt, as a dealer will charge you about £90 for an hour or half that for a half hour slot for a diagnostic - so trying a cheap code reader may be an option if you don't intend getting your own Lexia and laptop.
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Hell Razor5543 »

Roughly where in Surrey are you based? Town name will do.
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Itchigo55 »

Staines-upon-thames
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Hell Razor5543 »

While I am NOT on the list I do have a Lexia system (although I only have basic knowledge of its' usage). Do you know where the Ricoh offices are near the 3 Rivers Shopping Area (the offices are roughly opposite the Sainsburys)? I may be able to get there with my equipment and we can read the codes from the car (and then post up the results here so that people who are more knowledgeable can give you clear information).
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Itchigo55 »

Hell Razor5543 wrote:
21 Jun 2019, 19:05
While I am NOT on the list I do have a Lexia system (although I only have basic knowledge of its' usage). Do you know where the Ricoh offices are near the 3 Rivers Shopping Area (the offices are roughly opposite the Sainsburys)? I may be able to get there with my equipment and we can read the codes from the car (and then post up the results here so that people who are more knowledgeable can give you clear information).


You sir would earn many beers! I do indeed know it!! When's good for you, or I can pm you my mobile? Thanks!!
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Itchigo55 »

Oh for context it's a C4 Picasso 2014 exclusive+. So the ignition advice for disconnecting the battery wouldn't work (keyless), oh and I can't get to the negative terminal, only positive.
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Hell Razor5543 »

It is highly likely that Marc will either know or can find out the correct procedure.
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Re: Citroen Picasso B78 Lexia needed.. Airbag light

Post by Itchigo55 »

Hell Razor5543 wrote:
21 Jun 2019, 19:40
It is highly likely that Marc will either know or can find out the correct procedure.


Yeah that's no problem, I'm sure there's a way around it.