SOS Malfunction

yeah_knee · 10-09-2020, 08:39 PM

Who can help me get rid of this? I've heard I can code it out/ go to the dealership and they do a software update... I hate dealing with the dealership so coding it out would be ideal

Boosted M5 · 10-09-2020, 10:36 PM

I have a friend that works at bmw as a service writer. Normal procedure is to replace the whole telematic control unit which would require coding after but he says you can get away with just replacing the battery. Part#84109297787. As far as location to the TCU I can't provide you with any info as newtis.com has been shut down. Realoem.com shows it somewhere in the back seat area. GL

SCD-1983 · 10-10-2020, 01:10 AM

Quote:

Originally Posted by Boosted M5

I have a friend that works at bmw as a service writer. Normal procedure is to replace the whole telematic control unit which would require coding after but he says you can get away with just replacing the battery. Part#84109297787. As far as location to the TCU I can't provide you with any info as newtis.com has been shut down. Realoem.com shows it somewhere in the back seat area. GL

One of my friends had the same issue, the battery had to be replaced. Really good advice here, enjoying the wealth of knowledge in this forum 👍🏻

Beast27 · 10-10-2020, 08:59 AM

Had this issue a couple months ago. At first I was annoyed with it at startup but didn't have time to address it. Oddly...the fault just went away.... a google search for it may describe the issue a bit better.

M5Rick · 10-10-2020, 09:24 AM

It's a handy bit of info that in case it happens to anyone, couldn't imagine there was a separate lithium battery for it.

TLK · 10-10-2020, 12:41 PM

It's probably just the battery. I had the same problem earlier this year. I bought the battery online and replaced it. The telecom box is in the trunk under the carpet on the left wheel arch. Maybe if you search somebody may have posted pictures when they did it. I did not. I used newtis at the time to find it.

yeah_knee · 10-13-2020, 01:09 PM

I bought the battery so hopefully that solves it

gutijoh · 02-20-2021, 05:15 PM

Quote:

Originally Posted by yeah_knee

I bought the battery so hopefully that solves it

I take it that the battery worked out? Just heard about this from a buddy and searched.

texsn95 · 08-15-2023, 03:24 PM

I got this error today, then ended up going away after about 30 minutes. Can anyone confirm this is a TCU backup battery failure and a photo of the location of it?

Edit: Found this, M6 but same year. Seems like many other models / years have it under the headliner. https://www.6post.com/forums/showthread.php?t=1714826

10-09-2020, 08:39 PM	#1
yeah_knee Captain 138 Rep 634 Posts Drives: 2013 BMW M5 Join Date: Jan 2016 Location: CALI iTrader: (0)	SOS Malfunction Who can help me get rid of this? I've heard I can code it out/ go to the dealership and they do a software update... I hate dealing with the dealership so coding it out would be ideal Attached Images
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10-09-2020, 10:36 PM	#2
Boosted M5 Private First Class 69 Rep 193 Posts Drives: F10 m5 Join Date: Dec 2018 Location: Sf bay area iTrader: (0)	I have a friend that works at bmw as a service writer. Normal procedure is to replace the whole telematic control unit which would require coding after but he says you can get away with just replacing the battery. Part#84109297787. As far as location to the TCU I can't provide you with any info as newtis.com has been shut down. Realoem.com shows it somewhere in the back seat area. GL
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10-10-2020, 08:59 AM	#4
Beast27 Lieutenant 358 Rep 429 Posts Drives: 2014 M5 Alpine White/Black CP Join Date: Dec 2016 Location: Charlotte, NC iTrader: (3)	Had this issue a couple months ago. At first I was annoyed with it at startup but didn't have time to address it. Oddly...the fault just went away.... a google search for it may describe the issue a bit better.
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10-10-2020, 09:24 AM	#5
M5Rick General 60101 Rep 19,569 Posts Drives: M5 F10 DCT Gunmetal Join Date: Aug 2018 Location: Southern England iTrader: (0)	It's a handy bit of info that in case it happens to anyone, couldn't imagine there was a separate lithium battery for it.
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10-10-2020, 12:41 PM	#6
TLK First Lieutenant 112 Rep 385 Posts Drives: '14 M5 CP, '12 550i, '04 545i Join Date: Sep 2016 Location: SF Bay, CA iTrader: (0)	SOS Malfunction It's probably just the battery. I had the same problem earlier this year. I bought the battery online and replaced it. The telecom box is in the trunk under the carpet on the left wheel arch. Maybe if you search somebody may have posted pictures when they did it. I did not. I used newtis at the time to find it.
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10-13-2020, 01:09 PM	#7
yeah_knee Captain 138 Rep 634 Posts Drives: 2013 BMW M5 Join Date: Jan 2016 Location: CALI iTrader: (0)	I bought the battery so hopefully that solves it
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08-15-2023, 03:24 PM	#9
texsn95 Private First Class 56 Rep 146 Posts Drives: 2014 Frozen Silver M5 Join Date: Feb 2016 Location: Houston iTrader: (0)	I got this error today, then ended up going away after about 30 minutes. Can anyone confirm this is a TCU backup battery failure and a photo of the location of it? Edit: Found this, M6 but same year. Seems like many other models / years have it under the headliner. https://www.6post.com/forums/showthread.php?t=1714826 __________________ 2014 Frozen Silver M5, CP, B&O, 601s 1995 Mustang Cobra - 347 stroker Last edited by texsn95; 08-16-2023 at 02:20 PM..
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