SOS Failure
 

Hi,

I have an issue with SOS call failure message coming up on my X5 E70 4.8i.

I posted another thread about my leaking panoramic sunroof which I believe is responsible but I want to put that to one side for the moment as I haven't seen any further leaking since I tilted/vented it.

I have been trying to get the radio working again by bypassing the TCU which didn't work.

My error codes are:

A670/present - FZD: Signal line, fogging sensor
E484/present - SMBF: K-CAN line fault
A1 A3/not present - CCC-ASK: Control-unit fault
E5C4/present - CID: K-CAN line fault
9CC5/present - FRM: Mirror heating, driver's side faulty
A559/not present - Instrument cluster: Supply was switched off (terminal 30g_f)
A554/present - KOMBI: No message (telephone)

I've tried putting in a new battery, checking fuses, using a MOST bypass etc but nothing works. Is anyone able to point me in the right direction?

I had a go at checking which modules had light coming from the MOST connector one by one and it looked to me like the TCU was failing so I tried a bypass but still the light didn’t get to the MULF. Then I played with disconnecting the DAB module and reconnecting and all the lights came on including to the TCU and the MULF. After a few seconds the lights go off again. Does this suggest a faulty DAB module?

I can’t bypass the DAB module as the bypass connector I have doesn’t fit the connector. I’m not sure where to get one that does or the part number.

You can remove most components at the most bus by repatching. The bus is behind the driver's side edge of the rear seat. The attached PDF shows how to add a most component to the bus. See step 9 forward. Follow the procedure in reverse to remove everything except the amp (I assume you have logic 7 amp). Use a flashlight shining down the fiber to identify where the fiber runs go.

Delete all paired devices from your I-drive. Then reconnect whatever you actively use. Sometimes this fixes the SOS failure malfunction you are talking about.


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Thanks I’ll take look to see if I can find the hub. I think I’ve got the top hifi AMP.

The menus for the phone settings can’t be accessed they are greyed out. Would a failure in the TCU cause this? Or could the DAB module not passing on the signal to the TCU also cause this?

Cracked it. It was the DAB module. By passed it by tearing apart the bypass plug to make it fit and boom the sound is back. No SOS warning etc.

Does anyone know if a DAB module can be swapped out without coding? Do I need to be careful of version number etc? Can I use one from a Mini for example?

Nice work. I think it can be replaced without coding but not positive. I would replace with same version if possible. Dealt with this same stuff on my e60, replaced a couple components and always went same for same just to be safe.

Edit: also no harm in just leaving the bypass

Annoyingly the cheaper ones on eBay seem to be the ones with a slightly different product code. The HW looks the same though. I’ve since read one guide on a forum which was for retrofitting where it seemed to suggest there is a VIN number stored in the module.

I'm also wondering if the DAB module might be a bit old school now as it doesn't support DAB+ which might explain why I got no signal outside the UK in Europe. I might look into options for DAB+ and whether the aerial can be reused for that. There are some nice looking android head units that replace the screen with a touch screen and sit over the top of CCC so you can switch between systems.

While the vin is stored in many modules, changing it is not required for it to function. An example being the i-drive controller has your vin stored in it. I don't know much about UK DAB but US HD Radio modules can be swapped without coding.

Interesting thanks. Does that include newer versions of the modules? As in can a newer module be put in place of an older module or does there need to be software updates to allow for newer modules?

Incompatible is possible but not probable. BMWs solution to this is to update the software to all modules so they are known compatible. As this is a MOST module, updates require an ICOM interface which makes it more costly and complex. With that said, this is low risk to purchase used and give it a try.

I think you’re right it would be a low risk and probably would work. I might look into other options first as the modules are DAB rather than DAB+ so are a bit old school now. Maybe time for a full android screen upgrade.

I joined and paid the subscription fee just to thank you for this suggestion. After months of getting the SOS error, I tried to fix it by using the Fiber loop connector to troubleshoot and tearing apart the car and dash to figure this out. It did not cross my mind that this was the issue. I was even going to pay someone $365 USD to code out the SOS error. This solution worked for me but this is how I came to the conclusion of doing this ... The key is to make sure that any paired devices are out of range OR the bluetooth is turned off on any paired phone(s) before attempting to delete the paired device from the BMW BT list. If not, BT will never engage and it gets stuck in search mode while also getting the SOS error and also disabling the AUX audio input.

My assumption of what is going on is that the BMW BT module has an issue trying to negotiate BT protocol with multiple newer phones, like a pari of Iphone 12s in my case. It could be that a software update cures this but I am not sure. In my case, the SOS error shows up again if I try to add a 2nd Iphone 12 to the system. If both phones are in the area when trying to negotiate a BT connection, it gets stuck in a software loop until an SOS error pops up.

My solution, until i understand how to code out the SOS error, was to delete the BT pairing from the BMW BT and to forget the BT connection from my iphone. Recycle the car and start the pairing process again.

If someone else can add to this on why a 2nd iphone 12 cannot be added to the system, please let me know.