Help required with warning lights

This is the Forum for all your Citroen Technical Questions, Problems or Advice.
JackMa
Posts: 15
Joined: 27 Jul 2025, 19:23
x 4

Re: Help required with warning lights

Unread post by JackMa »

I get 0.2 ohms when I connect the leads together and then the reading immediately goes to zero.
I have tested another resistor of 1 KOhms and it works perfectly with that one measuring 1.001 kohms.
On a couple of resistors I have even tried to sand a bit both ends of each resistor thinking that they might be covered in a thin coat/film and then measured, but even that didn't work. :(
User avatar
mickthemaverick
Moderating Team
Posts: 20119
Joined: 11 May 2019, 17:56
x 7793

Re: Help required with warning lights

Unread post by mickthemaverick »

That is quite bizarre. Have you tried a resistor both ways ie swap the leads? :)
Are you using the 200 ohm scale or the 2k one?
Can you post a pic of the resistor?
I used to be indecisive, now I'm not so sure!
I used to ride on two wheels, but now I need all four!
RichardW
Forum Treasurer
Posts: 12438
Joined: 07 Aug 2002, 17:12
x 1431

Re: Help required with warning lights

Unread post by RichardW »

Looks like all the belt pretensions have fired, they will need repairing / resetting.
Richard W
JackMa
Posts: 15
Joined: 27 Jul 2025, 19:23
x 4

Re: Help required with warning lights

Unread post by JackMa »

Morning All,
I'm a bit embarassed to admit that upon checking the resistors I bought, I realized that they were 2.2 M ohms and not 2.2 ohms.
That's why the multimeter didn't read anything.
I now bought another set of resistors of 2.2 ohms :)
User avatar
mickthemaverick
Moderating Team
Posts: 20119
Joined: 11 May 2019, 17:56
x 7793

Re: Help required with warning lights

Unread post by mickthemaverick »

No need to be embarassed, it's easily done and is why I had asked you to post a pic of them so we could check the values by the colour code. Let's hope the new ones will solve your issue!! :)
I used to be indecisive, now I'm not so sure!
I used to ride on two wheels, but now I need all four!
JackMa
Posts: 15
Joined: 27 Jul 2025, 19:23
x 4

Re: Help required with warning lights

Unread post by JackMa »

The 2.2 ohm resistors arrived and the airbag is not faulty!! :)
The problem was that the electrical connectors to the seat belts pretensioner weren't properly connected. I had to push them all way the in and that solved the issue.
The airbag warning light has now disappeared!! \:D/

I'm still working on the following warning lights:

- tyre under inflation detection system fault,
- Collision detection risk system fault,
- Automatic breaking system fault.
RichardW
Forum Treasurer
Posts: 12438
Joined: 07 Aug 2002, 17:12
x 1431

Re: Help required with warning lights

Unread post by RichardW »

What faults have you got left? Earlier pic showed an external temp sensor fault - this would upset the tyre pressure monitor.
Richard W