Originally Posted by gibbo_ireland

What resolved the issue was, in the center console, we removed the plastic cover and one by one went through each of the wires (of the cable with the big black connector, not the antenna cable) to see which had a live current and where the current stopped. By removing the blanking plate/eject button the current circle of the circuit doesnt complete. We figured this out by passing that part in creating our own complete circuit. After plenty of trial and error, once the circuit at the center console wiring was tested and confirmed had a live current, turning the ignition off, holding down the centre console talking head button for 3 secs, then turning the key to ignition 1, immediately showed the 3 LEDs on the nav screen. I released the button after 3 secs, it came up on my phone firstly as "Handsfree", then I put in the BT key, then it paired showing "BMW12345". Job done.