Airbag light: Part no for Xantia for steering column slip ring

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GiveMeABreak
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by GiveMeABreak »

There only shows one type of control unit for the airbags on a MK I Xantia.

As for configuration, there are only 2 options to be configured:

With, or without passenger Airbag. Although it does mention the diagnostic units to do this as the older ELIT or SOURIAU 26A. So you may or may not find the option in Lexia. I suspect that the unit you have will be configured for both anyway, but if you want to check, the configuration should be in the replacement parts menu, airbag / seatbelt, programming menu.
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

Thank you for your reply and forum editing!

Forgive my stupidity...

Will I get away with just replacing the unit like for like - or will it need recoding?

Thank you!
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by GiveMeABreak »

There is no other coding apart from the configuration options I mentioned, but please ensure you disconnect the battery and leave it for a good 10-15 minutes to allow the ECU airbag unit to discharge before attempting any work on it.
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

Thank you.

I am still waiting for the replacement airbag ecu to arrive.

I don't have any diagnostic/configuring tools.

I guess I shall just have to wait and see if it is configured for my car and hope that finally the airbag light goes out. Ready for the French equivalent of the MOT next week...

Thank you again!
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by GiveMeABreak »

It would be unusual for both airbags not to be configured, so fingers crossed.
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

Actually, my Xantia only has the driver airbag... RHD (french).

Will the configuration affect the airbag light? I ask this because I have a supposedly tested ECU coming but I am afraid the if the airbag dash light remains illuminated, I will not know if it is a configuration issue or another faulty unit...

I am loathe to go back to the main dealer here (France) for recalibration for single airbag only to find the replacement unit is also faulty!

Parts dealers keep telling me I need the exact part number (550 40 25 00, 9622585780) replacement and these are rare as hens teeth... From places like Bulgaria, Lithuania etc... Is this true?

I must say that I am still somewhat confused as to the interchangeability of these parts as there are many available on the internet for the X2. Can I use on of these and just have a Citroen dealer recalibrate for single driver side airbag?

I have asked these questions at the dealer here, but they seem unsure and say they need the car to see. Each visit being a full main dealer charge in €'s... :(
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by xantia_v6 »

A controller that is configured for 2 air bags will certainly not be happy if it only sees one. It is possible (and in this case I think reasonable) to fool the controller into thinking that a non-existant airbag is present by connecting a suitable resistor across the terminals where the passenger airbag would have been connected.

I think that all mk2 Xantias had 2 front airbags They also have a switch to disable the passenger airbag, which may have required an updated version of the controller.
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

Thank you for your reply.

Hopefully the ECU will already be calibrated for a single airbag. If not, I had also thought that this might be a solution. Though it brings the problem of finding the terminals. I'm not sure if there is already a wiring loom in place for the (as it was) optional passenger airbag.

I guess it might be trail and error if I have to locate the relevant terminals.

Fingers crossed!
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by xantia_v6 »

One of us will be able to find the diagram with the pin numbers if required.
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

Great, thank you Xantia_v6,

This is a fantastic forum with so many helpful contributors!

There is so little information on the internet regarding the Xantia airbag system. Haynes has virtually nothing and it's circuit diagrams don't help much either.
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

For my tired old phase 1 Xantia...
Finally the replacement airbag ECU has arrived. It has the same part numbers. The Citroen dealer is sure after the first diagnosis that the ECU is faulty.

After fitting, the light remains on. That leaves one or both possibilities that:
a) Replacement unit is non functioning (faulty or perhaps has been in a crash as the part is of necessity from a breakers), or
b) The unit was calibrated for a passenger airbag. My old Xantia only has the driver airbag.

I am reluctant to keep going backwards and forwards to the Citroen dealer for a diagnostic test each time.

Below is a photo of the ECU connector with the cables. It looks to me like there is no cabling for a passenger airbag. So, if I can place a 2.2 ohm resistor where the ECU expects the passenger airbag to be, I can fool it into thinking that there is one.

If the light goes out, the issue is sorted! If not, It would confirm to me that the replacement ECU is also faulty. I can then spend a small fortune on another.

Can anybody confirm which connectors are for the passenger airbag? The connector as shown is numbered from top to bottom 1(large green) - 15 (large red). I believe pins 3,4,5 & 6 are for seatbelt, pins 11 & 12 for drivers airbag, 14 to the seat pretension ECu's and 15 to power from ignition switch.

Mine is a french LHD - if that makes a difference?

Am I right?

Would I be right to think that, as I saw in a diagram somewhere, 9 & 10 is where the passenger airbag would normally go?

Also attached a photo of the connector on the ECU with, I believe pins numbered from 1 - 18 anti-clockwisestartingk from the left.
Attachments
IMG_2277.jpg
IMG_2276.jpg
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

I have been told over at Planete Citroen that Citroen cannot determine ECU faults with their diagnostics. Is this true?

Another has advised me to carry out continuity/resistance tests on the airbag and seatbelt pre tensioner circuits. I know that I can substitute the steering wheel airbag with a resister to avoid blowing up the airbag. Is this really likely to happen? Are there any issues with using a multimeter to test the pretension ear circuits?

Sorry for the barrage...
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by vmaxvmax »

I will test the circuits ay substitution resistors so as not to risk blowing the airbags or pretensions...

I believe that 2.2 ohms is the value for the driver airbag and seat pretensions - is that correct? I don't want to risk setting the pyro stuff off with my multimeter!

Help!
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by GiveMeABreak »

vmaxvmax wrote:
26 Feb 2020, 22:27
I have been told over at Planete Citroen that Citroen cannot determine ECU faults with their diagnostics. Is this true?

Another has advised me to carry out continuity/resistance tests on the airbag and seatbelt pre tensioner circuits. I know that I can substitute the steering wheel airbag with a resister to avoid blowing up the airbag. Is this really likely to happen? Are there any issues with using a multimeter to test the pretension ear circuits?

Sorry for the barrage...
There are certain tests that can be performed using additional adaptors and harnesses on some vehicles, depending on what tests are required. But Lexia cannot tell you what is wrong with an ECU internally - only whether it is operating or not.
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Re: Airbag light: Part no for Xantia for steering column slip ring

Post by GiveMeABreak »

vmaxvmax wrote:
27 Feb 2020, 09:27
I will test the circuits ay substitution resistors so as not to risk blowing the airbags or pretensions...

I believe that 2.2 ohms is the value for the driver airbag and seat pretensions - is that correct? I don't want to risk setting the pyro stuff off with my multimeter!

Help!
I would be very careful - Citroen do not recommend using a multimeter to test airbag circuits:
  • Never connect electrical harnesses to a pyrotechnic component other than those provided by the manufacturer.
  • Never use an ohmmeter or any other source of electrical current, on the pyrotechnic device (risk of deployment).
Before any operations, Perform the following operations:
Switch on the ignition
  • Check the operation of the airbag warning lamp in the dashboard (the airbag warning lamp lights up, then goes out)
  • Remove the ignition key
  • Disconnect the battery negative terminal
  • Wait for at least 2 minutes (wait 10 minutes in case of abnormal operation of the airbag warning lamp)