Airbag Testing...

[Rhothgar]

Time for me to start considering the next fault.

No communication with AirCon and Airbags!

So I took the airbag ECU out earlier and checked continuity on serial communications line from Pin 13 OBD to Pin 14 at the ECU. Obviously didn't want to load test it and couldn't as battery was naturally disconnected.

So how does one safely go about testing faults in the airbag circuit.

I could do a continuity test to the airbag ECU power (unplugged) but as a few will know load-testing is the way. I've just read some warnings about explosives being accidentally triggered.

I can obviously tear down the airbag ECU connector and back probe it but is it safe to do? Just on about testing power and ground to it in the first instance.

Is it safe for instance to take a voltage measurement whilst ignition is switched on to see if relevant pin is live?

Also, I could power probe the power pin (pin 1 from memory or is that ground and pin 15 is power - already forgotten so will check manual again before proceeding).

Powerprobe will tell if it is positive or negative without applying power or ground.

Was thinking of powering power pin whilst Lexia was trying to communicate and then grounding the earth if first option doesn't work.

Then if it reads, it should prove that either power or ground is an issue. Most likely to be power.

Are the internals known to go? I'd doubt it is strippable in its metal casing. I didn't pay to much attention to it. It's a Sagem-Autoliv.

[mickthemaverick]

Roger, when you start a new thread about a problem you need to specify which car you are talking about, as not everybody follows all the threads to know what is what!!

[Rhothgar]

Roger, when you start a new thread about a problem you need to specify which car you are talking about, as not everybody follows all the threads to know what is what!!

Just in general Mick!

But specifically about the Xantia S2 HDi LX 110 RHZ Super Fandango War Horse Special...

[wheeler]

Have you tried to communicate with A/C with the engine running?, something at the back of my mind is telling me that the older A/C systems only talk to Lexia when the engine is actually running.

[Rhothgar]

Have you tried to communicate with A/C with the engine running?, something at the back of my mind is telling me that the older A/C systems only talk to Lexia when the engine is actually running.

Good question. I cannot recall but I shall try.

[Rhothgar]

Well that was a nightmare.

Used mate’s IM608. Reads airbag modules.

It’ll post detailed info up when I’ve eaten.

Plug Lexia in. Do full read. Lexia blows and laptop blows too! Not plugged it on but sure it has blown as it normally beeps when it is down to 7% battery.

152C Seat belt trigger 2 open circuit.

[Rhothgar]

Luckily laptop battery had died without warning and Lexia is fine too.

Weird how that won’t read airbag ECU.

I see 152C is the usual connectors under the seat and best solution is to either solder the terminals rather than relying on crimp terminal or get rid of connector entirely.

I couldn’t see how to get into them!

Also looked to be some discolouration. Under magnification it doesn’t look like verdegris. Looks more like a conductive grease perhaps. Hard to tell.

Need to find out how to get connector apart. Issue uploading images at minute. HTTP ERROR

EDIT. It’s the damned forum time out causing the issue!!! Time’s out before you can type a message.

[myglaren]

EDIT. It’s the damned forum time out causing the issue!!! Time’s out before you can type a message.

That is unusual Roger. I'm often very slow posting but have never had a timeout.

[Rhothgar]

EDIT. It’s the damned forum time out causing the issue!!! Time’s out before you can type a message.

That is unusual Roger. I'm often very slow posting but have never had a timeout.

You obviously don’t ramble on as much as I do Steve!!!!

Is this on mobile you’re taking about it or PC?

[Rhothgar]

Oooooo LOOK what I’ve just found!

[myglaren]

EDIT. It’s the damned forum time out causing the issue!!! Time’s out before you can type a message.

That is unusual Roger. I'm often very slow posting but have never had a timeout.

You obviously don’t ramble on as much as I do Steve!!!!

Is this on mobile you’re taking about it or PC?

You might be surprised. On a low-power laptop.

[xantia_v6]

The forum timeout for submitting a post is 2 hours...

[Rhothgar]

The forum timeout for submitting a post is 2 hours...

When I use my iPhone it times out in probably 5 minutes. Always has. I have to remember to select all and copy as, on a number of occasions, I’ve lost long posts when I’ve proceeded to re-enter details. Clicked back and sometimes found nothing to copy again.

It doesn’t help having a complex password that is 13 characters long with number, letters and symbols.

[myglaren]

While I wouldn't even consider doing anything of the sort on a phone, far too fiddly, maybe composing in a word processor would make life easier for you?

[Rhothgar]

While I wouldn't even consider doing anything of the sort on a phone, far too fiddly, maybe composing in a word processor would make life easier for you?

I'll get my old Smith Corona XL500 stoked up with a shovel of coal, Steve...

I am more often than not remote from my PC so phone is always easier and cannot see how fast my fat thumbs can type!