SOS button for something else?

Hotter · 04-18-2019, 02:19 PM

Hi, I have removed my TCU module from E92 and now wondering could I use SOS button for something else?

I have pinpoint SOS button wire (31)

So my question are:

What voltage do I get if I connect something to pin 31 and the ground? will it be 12V?
Will it still give that voltage even if I coded out option 639 from VO and set "TCM_ALIVE_MONITOR -> nicht_activ"; "TCM_ID_MONITOR -> nicht_activ"?

ctuna · 04-18-2019, 04:24 PM

Why not just measure it.
Have you looked at the schematic for the FCZ

Mantraxalos · 02-13-2020, 07:53 PM

I know it's an older thread, but it would be so great to hardwire a radar detector or laser jammer using the SOS button. I've been tempted to experiment for some time. I'm not that good at electrical work, yet. Perhaps in the spring.

Dr U · 02-21-2020, 09:29 PM

You can make it an atmosphere light color switch like Mini has (also need to install some RGB LED)

Hotter · 02-22-2020, 09:25 AM

Documentation seems to be misleading though, it might be that from switch comes the ground not the power, but I have stopped researching this, as I did not find a good use for that button. If you will be able to do something with it please update us.

14YearLateMistake · 04-05-2022, 09:27 AM

I know I'm resurrecting this post yet again, so I don't expect an answer but it'd be cool if someone knew...

Quote:

Originally Posted by Hotter

Hi, I have removed my TCU module from E92 and now wondering could I use SOS button for something else?

I have pinpoint SOS button wire (31)

So my question are:

What voltage do I get if I connect something to pin 31 and the ground? will it be 12V?
Will it still give that voltage even if I coded out option 639 from VO and set "TCM_ALIVE_MONITOR -> nicht_activ"; "TCM_ID_MONITOR -> nicht_activ"?

I've been looking for a way to use the SOS button. Where can I find this wiring diagram?
If this is the pinout on the TCU plug in the trunk, this is great news.
I think this button could be used for activating a secondary fuel pump or NOS system in the trunk. There is also a green LED next to the button that can be used for acknowledgement or confirmation of availability.

04-18-2019, 02:19 PM	#1
Hotter First Lieutenant 72 Rep 381 Posts Drives: BMW E92 328i -> 330i Join Date: Feb 2018 Location: Lithuania iTrader: (0)	SOS button for something else? Hi, I have removed my TCU module from E92 and now wondering could I use SOS button for something else? I have pinpoint SOS button wire (31) So my question are: What voltage do I get if I connect something to pin 31 and the ground? will it be 12V? Will it still give that voltage even if I coded out option 639 from VO and set "TCM_ALIVE_MONITOR -> nicht_activ"; "TCM_ID_MONITOR -> nicht_activ"? Last edited by Hotter; 04-18-2019 at 03:27 PM..
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04-18-2019, 04:24 PM	#2
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Why not just measure it. Have you looked at the schematic for the FCZ
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02-13-2020, 07:53 PM	#3
Mantraxalos Second Lieutenant 78 Rep 244 Posts Drives: 2006 330i Manual Join Date: Nov 2016 Location: Detroit iTrader: (0) Garage List 2007 Z4 3.0i [0.00] 2006 330I [0.00]	I know it's an older thread, but it would be so great to hardwire a radar detector or laser jammer using the SOS button. I've been tempted to experiment for some time. I'm not that good at electrical work, yet. Perhaps in the spring.
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02-21-2020, 09:29 PM	#4
Dr U Registered 0 Rep 4 Posts Drives: 07 BMW 328i (E93) Join Date: Feb 2020 Location: San Diego iTrader: (0)	You can make it an atmosphere light color switch like Mini has (also need to install some RGB LED)
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02-22-2020, 09:25 AM	#5
Hotter First Lieutenant 72 Rep 381 Posts Drives: BMW E92 328i -> 330i Join Date: Feb 2018 Location: Lithuania iTrader: (0)	Documentation seems to be misleading though, it might be that from switch comes the ground not the power, but I have stopped researching this, as I did not find a good use for that button. If you will be able to do something with it please update us.
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