Audio Systems: bluetooth mute wire to stereo, gmc yukon, bluetooth car kit

Question
QUESTION: Hello.
I purchased a bluetooth car kit for a 2005 GMC Yukon.  The stereo is factory double or 1 1/2 din with the single CD player.  The vehicle also has Onstar.  I'm searching for the mute wire to the stereo so during calls it will mute itself.  Any help would be appreciated.
Thank you,
Thomas
ANSWER: it is not that simple it is a module that you needs
what bluetooth kit you have

---------- FOLLOW-UP ----------

QUESTION: Hello.
Thank you for the fast response.  I have the Mokia CK-1W bluetooth kit.  It puts out a negative signal when making calls.  I was hoping that the stock stereo had a trigger input to mute during calls.  Otherwise, I was thinking of hooking up a relay inline to the 'on' wire of the stereo to temporarily cut power during calls.

Answer
If the vehicle was a ford yes is just one cable with negative power,
in your case the phone option uses the onstart part and telephone shows on the radio display  the interface is about 70.00 to 90.00 and they only make them for parrot and motorola
call oemautosound.com maybe there is a way to make work with your kit