w211 SRS light Error how to remove?

[Julemanden]

Hi.. I got the srs light in my dash ,i got it after the first real winter night, but i have checked the connection under the passenger seat but its looks all okey and connected, i have try to delete the error with the Icarsoft scanner, but the error pops up agian. i got error 9382 "n2/7 ( restrain system control module) : Coding is faulty" Do any know what i need to check or replace?

Hope some can help.

 

[Botus]

if your diagnostic tool is correct.... you already gave us the full answer

"n2/7 ( restrain system control module) : Coding is faulty"

this means something about your specific car is now confused... the simplest way to try and unconfuse, is to get a main dealer (and or a very good independent who rents from merc the very same dealer equipment) to try and reflash the module and SCN it back to std.

this is the same sort of issue as here, if this is the car in your signature.... I expect someone has bolted on secondhand parts and not set things up correctly https://forums.mercedesclub.org.uk/index.php?threads/cant-find-esp-module-looked-everywhere.186486/

coding means specific set up unique to that car... look up SCN on the internet. On safety related components like ABS, ESP or SRS - airbags) the chassis number is an integral part of the software operating correctly. So bolt on a part from an identical car and it won't work.

Tools exist to remove the data and write different vehicle data. However there are safety related concerns to doing this on the modules I mention above and anti-theft ideas in others like the engine and gearbox ECUs. So each manu makes it incredible difficult to get at. Safety and Theft concerns make it a very non standard thing to do and few have the naughty software or the skills to use it. And even once the chassis number, immobiliser data, vehicle mileage info etc. is successfully swapped over, the car configuration for the features fitted in that vehicle is another step that may be necessary. Like how many airbags it has, seat belt buckles, occupancy sensors etc.

If you buy a crashed vehicle and it popped it's airbags, the module to fire the bags has captured data about the crash and the manu usually want it back to analysis this info to check it worked and or improve how to build cars. So its supposed to be dead after a big crash. But naughty crooks can reflash it back to before the crash for 25% of the cost of a new part (and avoid the dealer SCN set up charge). I was discussing this a while back and the guy was telling me.... the capacitors in the module to send the data to the airbags get damaged so a reset isn't really a good idea, as the next crash things might not go as the manu intended....

 

[Julemanden]

Thanks for the reply, i got the car for over 2 years now and newer had any issue with the srs system before this week, is that normal to get that error that late if the parts have been swapped years ago?

 

[Julemanden]

Btw i found this on the error code 9383 The resistance value in the ignition circuit containing component R12/26 (Front passenger seat belt force limiter) is too high. maybe that is the problem?

 

[Botus]

thats the trouble with diagnostic kit... its doesn't always help much.
So the car was normal and got old, and now has a fault.... that's unlikely to be "Coding is faulty"

seat belt buckles can play up that's common with high miles, on mine at some point a very light tap on the left front bumper (paint only) caused the crash sensor to give up, that intermittently threw an air bag light with B42 having moment, 40 quid and a 10 mm nut sorted it out. It used to come and go with the battery being a bit low then vanish for 6 months... Progressively became more irritating, till stayed on after about 14 months, then some one said a small tap can kill it and told me where it was and the part number I needed. Been right as rain for 4 years ever since I swapped it out (sits under the headlamp on the end of each chassis leg)

 

[Botus]

I've got an issue on my car two tools snap on £3k and autel £900 diagnostics reports 100% the same error code as Mercedes dealer tool xentry prints out,

all three tools tell me N10k2N relay is not energised (control circuit is dead... ) but on other pages in live data, I can see the relay is ON (which is impossible if the first error is real !!!!!)

 

[mattkh]

Thanks for the reply, i got the car for over 2 years now and newer had any issue with the srs system before this week, is that normal to get that error that late if the parts have been swapped years ago?

As of late, batteries are running so low due to lack of use, that some modules may even be losing their memory.

 

[mersum1es]

Yep, I have fixed one such error, dead battery caused module to lost VIN code.

 

[Botus]

Yep, I have fixed one such error, dead battery caused module to lost VIN code.

was it a fairly old module ?

the nvram shouldn't forget life... but as they get old and worn out I guess its possible... with everything OK holding life together all works, then one day the battery goes low it needs to find the info and the chip that has it, has given up... and now the whole module has lost the plot

 

[ajlsl600]

Just another grand reason to get away from electrickery, electronics only one I want to see electronic ignition

 

[Botus]

I've got an issue on my car two tools snap on £3k and autel £900 diagnostics reports 100% the same error code as Mercedes dealer tool xentry prints out,

all three tools tell me N10k2N relay is not energised (control circuit is dead... ) but on other pages in live data, I can see the relay is ON (which is impossible if the first error is real !!!!!)

just been checking this out... the feed to the control circuit is working and the relay switches on (just swapped it out for good measure) ....

got to love cars !!! trouble is NO idea what it powers up and too thick to mention that even in the dealers stuff

 

[mersum1es]

was it a fairly old module ?

W211 pre-facelift car

 

[Julemanden]

W211 pre-facelift car

So i need to get the module a re coding or?

 

[mersum1es]

So i need to get the module a re coding or?

Probably. Or then there are communication problems with CAN or SAM, essential is that you need to get connect to SRS box by device which can do intialization (SDS 100%, others £££ systems IDK). SCN may not be needed.