Mercedes-Benz Forum banner

1 - 20 of 46 Posts

·
Registered
Joined
·
49 Posts
Discussion Starter #1
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!
 

·
Registered
E320/E250 Bluetec Ford F350 6.7l
Joined
·
36,727 Posts
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?
 

·
Registered
222.132 & 221.122 & 213.050 & 906.633
Joined
·
10,426 Posts
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?
 

·
Registered
Joined
·
49 Posts
Discussion Starter #4
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
 

·
Premium Member
2004 CLK 240 Coupe
Joined
·
11,377 Posts
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.

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.

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

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.

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. :thumbsup:
 

·
Registered
222.132 & 221.122 & 213.050 & 906.633
Joined
·
10,426 Posts
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.
 

·
Registered
Joined
·
49 Posts
Discussion Starter #7
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
 

·
Registered
E320/E250 Bluetec Ford F350 6.7l
Joined
·
36,727 Posts
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"
 

·
Registered
Joined
·
49 Posts
Discussion Starter #11
Ok so ive had a star machine hooked up and i get these faults:

AB AIRBAG -F
DR SIDE SAM DRIVER SIGNAL Acquisution and actuaton module -f
REAR SAM rear signal acquisition -f
OCP overhead control panel -f
UCP upper control panel -f
LCP lower control panel -f
IC instrument cluster -f
ASSYST active service system -f
SCM MRM steering column module -f
PTS parktronic system -f
AQW audio 20 with integrated gateway -f
DCM FL door control module -f
DCM FR door control module -f

So obviously the major fault is the airbag module, My question now is it obviously needs re coding(or replacing?), can me and my friend do this ourself with the star machine? if yes what are the steps to take to do this? If one would be kind enough to guide. Would like to understand this software better.

Also any other thoughts on the above much appriciated.
 

·
Registered
222.132 & 221.122 & 213.050 & 906.633
Joined
·
10,426 Posts
Ok so ive had a star machine hooked up and i get these faults:

AB AIRBAG -F
DR SIDE SAM DRIVER SIGNAL Acquisution and actuaton module -f
REAR SAM rear signal acquisition -f
OCP overhead control panel -f
UCP upper control panel -f
LCP lower control panel -f
IC instrument cluster -f
ASSYST active service system -f
SCM MRM steering column module -f
PTS parktronic system -f
AQW audio 20 with integrated gateway -f
DCM FL door control module -f
DCM FR door control module -f

So obviously the major fault is the airbag module, My question now is it obviously needs re coding(or replacing?), can me and my friend do this ourself with the star machine? if yes what are the steps to take to do this? If one would be kind enough to guide. Would like to understand this software better.

Also any other thoughts on the above much appriciated.
Didn't you get any of the codes read, just the quick test result? SRS control unit would have been interesting, others not that important as you say.
 

·
Registered
Joined
·
49 Posts
Discussion Starter #13
Didn't you get any of the codes read, just the quick test result? SRS control unit would have been interesting, others not that important as you say.
You mean the exact faults with the srs module? if so i can hook it up tomorrow and tell you exactly whats failing..
 

·
Premium Member
2004 CLK 240 Coupe
Joined
·
11,377 Posts
When you replaced the airbags (how many had operated?) did you also replace the associated ignition squib which would have fired the airbag?

There are many (R12/1 - R12/17) that are all routed into the Restraint System Control Module (N2/7)
 

·
Registered
Joined
·
49 Posts
Discussion Starter #15
When you replaced the airbags (how many had operated?) did you also replace the associated ignition squib which would have fired the airbag?

There are many (R12/1 - R12/17) that are all routed into the Restraint System Control Module (N2/7)
The passenger seat and passenger roof airbags deployed, there the only ones i replaced. I'll put a full list of faults up from the srs im pretty sure there was a fault for every airbag inc driver seat airbag, steering wheel airbag..ect even though they wasnt deployed
 

·
Registered
Joined
·
49 Posts
Discussion Starter #16 (Edited)
Ok guys, star hooked up again.. Opened up AIRBAG faults and here is what i have...





So Before the test i replaced the passenger airbag AND the roof curtain airbag. It mentions no other faults with AB system apart from coding is faulty, as mentioned would happen from a member on this thread. So can i code myself using the initial startup feature? If yes what should i expect it to ask me/what will it do..ect? Im guessing i cannot.. but in which case, could i use original srs module or should i purchase a brand new one?

By the way last time i used star i erased the faults but there back again.(ie.. pass airbags resistance too low/high) why did they come back if i replaced the airbags?.
 

·
Registered
222.132 & 221.122 & 213.050 & 906.633
Joined
·
10,426 Posts
Ok guys, star hooked up again.. Opened up AIRBAG faults and here is what i have...

So Before the test i replaced the passenger airbag AND the roof curtain airbag. It mentions no other faults with AB system apart from coding is faulty, as mentioned would happen from a member on this thread. So can i code myself using the initial startup feature? If yes what should i expect it to ask me/what will it do..ect? Im guessing i cannot.. but in which case, could i use original srs module or should i purchase a brand new one?

By the way last time i used star i erased the faults but there back again.(ie.. pass airbags resistance too low/high) why did they come back if i replaced the airbags?.
Did you switch ignition on while you were working with the car and one of the airbags disconnected?

There could be a trick that you could try but you should get rid of the fault codes first. There must be a current issue with the front passenger airbag. The airbag connectors are typically such that the aribag side gets short-circuited when the connector is unplugged (either from the control unit or from the airbag itself). Perhaps one of the connectors is not installed properly to release the protective short-circuit (the short-circuit is intended to disable the airbag from firing up from static electricity discharges etc.).
 

·
Registered
Joined
·
49 Posts
Discussion Starter #18 (Edited)
Did you switch ignition on while you were working with the car and one of the airbags disconnected?

There could be a trick that you could try but you should get rid of the fault codes first. There must be a current issue with the front passenger airbag. The airbag connectors are typically such that the aribag side gets short-circuited when the connector is unplugged (either from the control unit or from the airbag itself). Perhaps one of the connectors is not installed properly to release the protective short-circuit (the short-circuit is intended to disable the airbag from firing up from static electricity discharges etc.).
Sorry been a while our star software corrupted, but we have it all sorted again. Fresh install from dvd.

Anyway i reseated the passenger seat airbag connector and ran a retest and it found the fault again. I cleared faults and ive ran a quick test 3 times and it hasnt picked the faults back up, even the airbag control unit coding faulty fault didnt pick up..(not sure if you have to wait a certain time before retesting?) Also when i did click initial coding it says the airbag control module is already interlocked and parameterization is not possible. Does this mean its unlockable? and i need a new airbag control unit?

But anyway i have one more major fault (-F) and it is short circuit on all glow plugs. It says check the resistance for each plug.. but im guessing the CDI control unit has the fault and not the plugs?
 

·
Registered
222.132 & 221.122 & 213.050 & 906.633
Joined
·
10,426 Posts
Anyway i reseated the passenger seat airbag connector and ran a retest and it found the fault again. I cleared faults and ive ran a quick test 3 times and it hasnt picked the faults back up, even the airbag control unit coding faulty fault didnt pick up..(not sure if you have to wait a certain time before retesting?) Also when i did click initial coding it says the airbag control module is already interlocked and parameterization is not possible. Does this mean its unlockable? and i need a new airbag control unit?
So you mean you got rid of all fault codes, even the control unit coding? There is a means to unlock the control unit via special functions but I doubt it would help here because of the crash data that would have to be cleared with other means.
 

·
Premium Member
2004 CLK 240 Coupe
Joined
·
11,377 Posts
Additional information

I don't have precise data for your W219, but here is the WIS page on the function of the Restraint System control unit (N2/7) for a W211, which you may find useful. This is located beneath the tunnel.

Additionally, I have read that there are 2 Frontal Acceleration sensors located on the radiator cross member. B48/1 (US drivers side), and B48/2 (US pass side). These should be replaced after a head-on collision, if the mounting area metal is deformed.
 

Attachments

1 - 20 of 46 Posts
Top