Airbags deployed vehicle engine disabled after crash..... - Mercedes-Benz Forum

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post #1 of 46 (permalink) Old 12-16-2010, 05:10 PM Thread Starter
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Question Airbags deployed vehicle engine disabled after crash.....

I have a mercedes W219 which i beleive is as close to a W211 you can get.

My issue is, i bought it accident damaged 2 airbags were deployed. Engine not starting.

Ive replaced the airbags and had a new battery fitted as had been sitting for 5 months. Anyway now when i turn the key in the ignition i get SRS MALFUNCTION VISIT WORKSHOP, And when i go to crank her up it clicks once (no not several clicks to indicate a dead battery) just 1 click.

Now upon lots of research it seems i need a star machine hooked up to her and get the srs error codes erased this im told will solve the issue.

However someone else has mentioned the positive battery cable will be damaged due to impact in the accident(a self destruct cable he mentioned)

Others say it needs the srs module re programmed with a star.

And others say the fuel cut off switch 'inertia switch' has been triggered and needs to be located to be reset.

Can someone on here give me a 100% definate answer as to what EXACTLY happens to a mercedes when the airbags are deployed? and what i need to do to get the thing started? Everybody seems abit HUSH HUSH about this topic with no REAL mention on what exactly goes on/happens after a airbag deployment. And all mercedes specialists have given me the above answers which are confusing as they are all different!
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post #2 of 46 (permalink) Old 12-16-2010, 06:08 PM
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100% answers? Would such exist, we wouldn't need a forum with thousands opinions, would we?
I am not familiar what system UK model might have, but your symptoms are very common for low battery voltage. Can you display voltage on car cluster, or at least hook up voltmeter close to the starter?
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post #3 of 46 (permalink) Old 12-16-2010, 11:35 PM
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If you insist on 100% definite answers, you scare most members away.

Officially you would need a new SRS control unit after an accident. There are unofficial means to clear the crash-data but simple fault code erasing with Star is not sufficient.

These cars usually have a "pyro-fuse", a piece of cable that is cut of at a severe accident with an igniter (a bit like blowing an airbag). I cannot remember where this is located in a W211 but you should have WIS anyway when working with issues like this and WIS explains how the car works and where the parts are located.

Sounds like the accident was not bad enough to fire the pyro-fuse.

Is the faint click from the starter relay or the starter motor solenoid?
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post #4 of 46 (permalink) Old 12-17-2010, 07:34 AM Thread Starter
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Thanks for your input. The reason i ask for 100% answer is because its a safety feature on mercedes and i feel atleast a mercedes specialist should know exactly what happens in a accident. I know for sure a bmw i had and a fiat i had both of those i bought damaged needed a ecu reset to get the car started and it had same symptoms as the mercedes. Also my friend had a honda civic and a bmw mini cooper which also had the same issue the mini just needed fuses where as the honda needed a ecu reset.

Like ive said most people have told me a error code erase will solve the issue using a star machine. Although some mercedes specialists seem to think otherwise. I would be interested to get this sorted even more now knowing there is a variety in opinions.

As mentioned above regarding the pyro fuse, I beleive this is sort of like a airbag cable and i think it is at the positive terminal or close to that from the battery. I will need to check that. As for the solinoid noise im not sure where the noise comes from.

I will erase error codes in the next week or 2 and post back results if it fixes it or not. Feel free in the mean time to post away with your previous experience from a accident damaged mercedes
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post #5 of 46 (permalink) Old 12-17-2010, 05:55 PM
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Now upon lots of research it seems i need a star machine hooked up to her and get the srs error codes erased this im told will solve the issue.
That is correct. But there could be another fault present after a crash.

Quote:
However someone else has mentioned the positive battery cable will be damaged due to impact in the accident(a self destruct cable he mentioned)
I don't believe that your car has a 'thermal-link' or pyro fuse, as DB suggests.

Quote:
Others say it needs the srs module re programmed with a star.
STAR DIAGNOSTICS, yes.

Quote:
And others say the fuel cut off switch 'inertia switch' has been triggered and needs to be located to be reset.
There isn't one of those on a recent MB, to the best of my knowledge.

Quote:
Can someone on here give me a 100% definate answer as to what EXACTLY happens to a mercedes when the airbags are deployed?
That's all that happens. There are no signals from the SRS to the fuel pump, ignition control, etc.
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post #6 of 46 (permalink) Old 12-18-2010, 03:05 AM
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I don't believe that your car has a 'thermal-link' or pyro fuse, as DB suggests.
Correct, I should have posted this too after I had a look at the wiring diagram. The 219 does not seem to have this pyro-fuse like in a 221.
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post #7 of 46 (permalink) Old 12-18-2010, 04:05 AM Thread Starter
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Thanks guys much appriciated

I agree a crash can cause other problems, i think ive read up another merc sam unit failed in a collision. just will have to wait and see, Will post up results in due course.

Thanks
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post #8 of 46 (permalink) Old 12-18-2010, 09:50 AM
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i feel atleast a mercedes specialist should know exactly what happens in a accident.
Here in the USA at least, this knowledge is more likely found at a body shop rather than where Mercedes mechanics work.

Kent Christensen
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post #9 of 46 (permalink) Old 12-18-2010, 11:45 AM
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In CA cars with bags deployed are usually totaled. No reputable body shop will touch them, so they go on auction and go to shade tree rebuild shops that repair them and sell for profit. Meaning such information would be on "black market"
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post #10 of 46 (permalink) Old 12-18-2010, 03:35 PM
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I remember we discussed airbags in 2008.

http://www.benzworld.org/forums/w163...lawsuit-3.html

I'm surprised to read about totalling cars with airbags deployed. For an idea of their sensitivity, see post #24 of this thread above ...
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