Tel Mute Pin #10 X13812 does not work

[conandrum]

Hoping someone can help,

I need to be able to mute my CCC at will, in my E71.
I attach some posts I found online ...
https://www.e60-forum.de/forum/index...353#post411353
https://5series.net/forums/diy-do-yo...e2/#post968671

...and a diagram of my FAKRA plug at the back of my CCC head unit.

This afternoon, I measured the voltage of this pin at 4.85v (pin #10 in the X13812 connector).
I then connected the pin to the chassis but no muting occurred.
I then connected the pin to the center of my cigarette lighter but no muting occurred either.

Anyone knows how to get this working?

PS.
A. My OEM FAKRA plug does not have a wire going to this pin (CCC->PIN#10->OEM FAKRA(X13812)->NO WIRE @ pin#10!). To connect to this pin I used the harness of an Android head unit which has this wire in place (CCC->PIN#10->NEW FAKRA(X13812)->wire->OEM FAKRA(X13812)->NO WIRE @ pin#10!).

B. Is it possible that the pin has to connect via FAKRA to the amp (CCC->PIN#10->FAKRA(X13812)->wire->SOME_DEVICE)? If so, then grounding only the pin itself will amount to nothing. If so, then where should this pin connect to, before I ground it?

C. My E71 has a factory phone cradle in the armrest compartment. I conclude that this pin is not related to the phone cradle since no wire connects to the pin.

[conandrum]

I found this diagram:
https://5series.net/forums/e60-e61-p...s-jump-152311/

It shows the CCC & the X13812 with pin#10 BLK/VIO, going all the way across, but does not show where it terminates.

Can someone please chime in and solve this riddle?

[conandrum]

This guy in his E60, with the same FAKRA as the E71 CCC, utilised the 'radio mute' pin with a parrot 3100.

https://www.bimmerfest.com/threads/m...nstall.269407/

[conandrum]

I found a quote here:
https://www.bimmerfest.com/threads/s...nsors.1296895/
"Here is the wiring diagram for the TCU (Telematics Control Module) that controls telephone calls via bluetooth connection with your cell phone, or the emergency service (SOS) calls to BMW Assistance. You will note that there is a "Mute" connection from the TCU to the Radio (N9), Pin #10 of Connector X13812.
https://www.newtis.info/tisv2/a/en/...ectors/connectors-from-x4/x4553-x4553/oMvixPX"

Of course the diagram is long gone.
Can anyone help please?

[conandrum]

I sent an email to bimmergeeks (Protools) asking:

I want to enable the 'radio mute' pin on my CCC (X13812 pin), so that I can mute the CCC remotely using a button. Are these possible using your device?

Answer:

The radio mute not sure if that's a codable option to enabled assuming you are retrofitting it wiring wise.

Can anyone of you coding gurus please tell us if 'radio mute' option can be enabled by coding on the CCC?

[conandrum]

I sent another email to bimmergeeks (Protools) asking:

I am assuming that mute functionality is disabled,
simply because the pin is labelled ‘radio mute – INPUT (E)’ by BMW.

Answer:

Would really depend on the daten file in the headunit, but brief look there are the coding options:

MUTE_PIN_BEHAVIOUR
MUTE_PIN_SOURCE

I checked with NCS DUMMY and found the following:

MODULE : CIC
SECTION : AUDIO_TUNER_TRAFFIC - Audio tuner traffic messages

SUBSECTION : MUTE_PIN_BEHAVIOUR
OPTIONS : no_function/permanent/trigger

SUBSECTION : MUTE_PIN_SOURCE
OPTIONS : no_source/mono_aux_mixed/mono_aux_exclusive/stereo_aux_exclusive/entertainment_mute/security_exclusive

SECTION : TELEFON_TELEMATIK_ONLINE
SUBSECTION : MUTE_BUTTON
OPTIONS : aktiv/nicht_aktiv

VERSUS

MODULE : CCC_APP_{C09/C0A/C0B/C0C}:
SECTION : CKM_9901 - Car/key memory for programmable buttons
SUBSECTION : K9901_MUTE_EIN - Programmable button for audio muting
OPTIONS : par_frei - parameter available
: par_gesperrt - parameter locked

QUESTIONS:
1. Is K9901_MUTE_EIN (CCC) used to enable/disable the existing mute button on the volume knob?
2. Is K9901_MUTE_EIN (CCC) the equivalent of TELEFON_TELEMATIK_ONLINE (CIC)?
3. Shall I conclude that the MUTE_PIN cannot be programmed with CCC?
4. Shall I conclude that the MUTE_PIN can be programmed with CIC?

[ard]

Thanks for documenting this!

[conandrum]

Originally Posted by ard

Thanks for documenting this!

If you are interested in muting the CCC, watch the post I am about to post in this thread: https://forum.allaboutcircuits.com/t...d-unit.199642/