[carlosalbertogui]

hi

i have a bmw e91 and every time i start the car
i have this error SOS call System failure!!!!
the bluethooth still working and every thing works as it shoulds
can you please help me ==???
i have make a visit to bmw and they clean the error after 20 mins error again ... do i have to change the TCU unit or there is something i can do

best regards

[snoozee]

Sounds like TCU is dying

[carlosalbertogui]

how much for the TCu do i really need one or can i code the tcu to get rid of the error !!!! everything is working as it should i just have the annoying error SOS call System failure!!!

[ctuna]

Loose Connectors.
often cause intermittent problems.
Try re seating or pushing down on connectors in the areas effected .

[carlosalbertogui]

i dont think its loose connectors but i will give it a try.....

anyone now a way of coding SOS feature to be disable

best regards

[dylim]

Yes, just connect to the TCUM using NCSEXPERT, and then change a variable - can't remember off the top of my head, but the variable name is very obvious.

[snoozee]

Originally Posted by carlosalbertogui

i dont think its loose connectors but i will give it a try.....

anyone now a way of coding SOS feature to be disable

best regards

using NCSExpert, remove $612 from the FA/VO listing.

[DR-JEKL]

I had this error pop up on my dash today, upon starting the car the legal disclaimer stayed remaining on the idrive for a few minutes and the idrive controller would just spin and not respond. The time date etc was all blank on the idrive at the time.

Eventually the error cleared from the dash, and the bmw screen on the idrive system popped up for about 30 seconds then everything worked as per normal!?!?

[carlosalbertogui]

I still have the error every time i start the car

[carlosalbertogui]

can someone code TCU

A TCU (telematic control unit) can Only be ordered by specifying the Vehicle identification number. The VIN is coded when the replacement TCU is delivered. Recoding is not Possible. The TCU functions properly Only with matching coding. Replacements TCUs cannot therefore be ordered in Reserve! Retrofits and conversions To SA633 are not possible...

i have SA633 .......
now a have a SOS call System error everything else is working as i should be ....

any help

[e2d]

I've been told it could be the MOST bus connecter is cut. I've had a subwoofer installed in my e90 and I get the same SOS failure you get. Everything else works its just the Bluetooth that doesn't. I'm planning on taking a look at this today.

[carlosalbertogui]

how it went do you manage to solve the problem ???????

sos call system failure

[carlosalbertogui]

Still have the error SOS call System failure every time i start the car

everything else working well

bluetooth , i drive sound radio etc

[AWBimmer]

Recently upgraded my sound system.. full 3 way upfront plus sub woofer in the back with 2 amps (4 ch and mono amp for sub).. plus have JBL MS8 and Technica Harness.

My Bluetooth doesnt work and I now get the SOS warning light everytime I start the car... bad times!!

[carlosalbertogui]

can i put a new tcu without recoding or program it ???

[dylim]

Originally Posted by carlosalbertogui

can i put a new tcu without recoding or program it ???

Instead of replacing the TCU, you can just code the SOS error out using NCSEXPERT.

I think if you do replace the TCU, you might loose voice control, sos functionality and other features unless you use winfkp to change the VIN inside the TCU, so it's more involved.

[ctuna]

Do you have the exact steps for coding it out?

Because I have seen no posts where there has been
definite success at doing this.
But it should be possible.

There is a replacement procedure somewhere on the Technical Service bulletin with a procedure on replacing it . It does require some kind of activation.
(for TCU replacement)

[dylim]

Originally Posted by ctuna

Do you have the exact steps for coding it out?

Because I have seen no posts where there has been
definite success at doing this.
But it should be possible.

There is a replacement procedure somewhere on the Technical Service bulletin with a procedure on replacing it . It does require some kind of activation.

Yes I do, I will find my notes when I get back home tonight and post the exact entry you'll need to change. I did this when I retrofitted CCC, 6FL, and BT. Since I didn't want to get the FZD with the SOS button, I had to code out the SOS button check.

[ctuna]

But you still have a Mulf or a TCU?
Also bluetooth comes from the TCU on the
older cars I think.

[dylim]

Originally Posted by ctuna

But you still have a Mulf or a TCU?
Also bluetooth comes from the TCU on the
older cars I think.

I have both MULF high is used for the USB, and TCU takes over the phone/BT functions.

I just looked at my notes. To code out the SOS check, just use NCSEXPERT, connect to TCUM, and change E_CALL_HARDKEY_FITTED to nicht_aktiv.

[ctuna]

Thanks
I am wondering if the people that remove there head units
are stuck with a SOS error signal , unless they relocate the head unit.
(Also the guys that replace with the newer Head Units that don't require a Mulf or TCU.)
As the head unit buffers
the communication of the TCU or Mulf to the gauge display.
I am wondering if the display or Kombi has a way to disable it
either as a hard jumper or programming value.
The dirty fix would be to cut a trace to the LED that for that
particular error.

[snoozee]

removing $639 from the VO list will remove the BMW assist feature and should get rid of the error.

someone mentioned that the below steps solved his problem.

Ok so I finally got around to changing my VO and getting rid of this SOS error.

The value to add to the VO was +TELD. Not -TELD!!!!

FA_Write to CAS and FRM.

SG_Codieren TCUM, CAPPL, KOMBI, and ABG.

Error is now gone!