Resetting service warning lights

AIUI there's a big difference between (a) touchy in normal use and (b) touchy when being cut into bits by rescue services, welded etc. Certainly rescue services used to be given advice by makers on the the procedures for rescue. IIRC (albeit only from hearsay from someone once in the business) some just required the battery[1] disconnected, some stated a deactivation time to wait if possible for the airbag system (including any energy reserve module) to discharge.

[1] or batteries: IIRC some posh Mercedes models with 2 were a bit of a risk for the unwary

I've actually found a figure on Wiki. Needs a pulse of 1-3 amps for less than 2 milliseconds to ignite the 'fuse'.

Airbag makers say the low end of their operating voltage range is 9v, so would be fair to assume the current at that towards the upper end of the range.

I wonder if that is up to date if it is the Wiki article that also refers to "The electric match, which consists of an electrical conductor wrapped in a combustible material". I had thought those had been overtaken lately by thin film igniters. Vishay make a lot of parts for airbags and offer EPICs and MEPICs with much lower firing energies and times. The former down to 50 microjoules and 50 microseconds, the latter to 1.5 millijoules and 250 microseconds.

But perhaps Dennis will finally share some facts and figures.

Of course there are plenty of news reports that claim the airbag went off for no good reason so I expect my view is more correct than yours, but who knows?

For example..

Plenty more on google.

"Pass me the airbag light timing sequence book" said no MOT tester, ever!

I ran an MX5 for a number of years with such an setup.

That actually has some interesting bits.. like...

For a change you are correct, they haven't passed the date yet, but by April 2019 they should have.

I have told you look for them yourself and you might learn something. Have you bothered to find the two posts that have the links in them that you claim to have missed? I'm not going to do it for you so either do so or shut up moaning about it.

You still have 4V at the end of it, are you saying it won't fire an airbag now or still saying it will? As I said before the voltage is fairly irrelevant but you disagree, do you want to explain why or just keep on with cr@p comments.

Lead azide would get you sued by every crash victim. You are probably thinking..

60 % sodium azide (NaN3), 20% potassium nitrate (KN03) 20% silicon oxide (Si02)

You can thank huge for that.

Its obviously is to you as you keep saying 4V will set it off when its the energy that matters not the voltage.

automotive. You are very welcome.

Are you ever going to contribute something useful in this group or just keep trolling? I don't think you have ever posted something useful here or anywhere else. Are you huge by another name? Maybe you are jws or Australian?

Now, now don't call Fredxx a liar just because he can't read the posts.

Between us we quoted the succinct section that makes it an offence to drive any car which fails in any way to meet the construction and use regulations. This is not even confined to explicit safety regs. I am surprised at the draconian nature of this law, but law it is. Section

42 of the relevant Act, interestingly enough.

What we don't have is the full text of the construction and use regs and how they apply to each and every model of car, and indeed to ad hoc registered cars. I doubt if this exists as a single document, which makes it even more outrageous that breaching it is now a crime. But the section 42 has been shown. And *if* there is a regulation that says fitted airbags have to be working in a given car then driving when they are not working is undoubtedly a crime under this section.

Just because you don't understand energy doesn't mean other people don't understand ohms law.

Try this..

suppose you have an igniter that is 10 ohms and it needs 8 amps for

200mS to go off how do you do that with 4V?

Now AFAIK a lot of igniters in airbags have similar specifications unless you want to post links to ones that are 4 Ohm and need 1A or something similar so they will work off 4V and explain why they would use them in a 12V system?

They don't need a book, the computer should tell them the sequences.

I think they are just trolling and I am killing this thread.

They just don't bother checking. "Does it illuminate then extinguish" is the extent of their testing.

I have and there aren't any posts.

Non-existent posts, a figment of your imagination.

Then stop replying when I say these posts don't exist.