Remember that you're old radionavi RNS315 had INBUILT bluetooth. The mic cords that are in your old C block are now going to your new BT module and are already connected in your new harness. So you have two options, to either take this new mic wire from the harness to the roof to the existing mic or do some soldering.
OK. That makes sense. I don't want to have to run that line up there so my preference is to use what is already up there, assuming the mic impedence is correct (which it should be). I do however want to be able to use the current 'talk to my NAV' option as well as to be able to use the mic for BT phone calls. I wonder if that means using the MIC OUT lines on the block C to go to the BT module are therefore going to be necessary to do both...
Those are CAN high and low which you need to connect to wires going to radio quadblock pins 9 and 10.
From those 10 wires from the BT connector in your new harness. 4 are to green block, 4 are to the main quadlock (+12v, GND and 2 CAN wires (twisted ones)) and 2 wires are going to roof mic.
Yes, after posting I went and looked at the current harness in the car and saw 2 twisted pair wires exactly the same color going to CAN high and low so that cemented in my mind what those 2 lines were. Everything you say now makes send with just one question - do I ADD the two new CAN high / low lines to the EXISTING lines that are there? Or do they REPLACE the two lines that are in the block D with the 'new' CAN lines? My thought is that both need to be present but I would like a second opinion so as not to screw something up.
Thanks!
Frank in Michigan