This is the info I found and used successfully. I believe I had radio set on AUX, bluetooth. Took about 10 min and now Nexus 6 (NOT on Acura website list of phones) works.
hit the top button for the handsfree link (HFL) and say "phone set up".
phone set up options are : status/ pair /edit/ delete". Hit the button again and say "pair". The pairing process requires operation of your bluetooth phone. Please make sure you are in park when pairing. Please state a four digit code, note this as you will be asked by your phone to connect. Hit the talk button again and say your code. 1111 is this correct? Hit the button again and say "yes" if it is and then it will say handsfreelink is searching for a new phone please make sure your phone is in discovery mode. It will then search it will show on your phone then you type your code in and it will say a new phone has been found what would you like to name this phone? "name it" Then it will say "name it" has been successfully stored returning to the main menu and you are DONE!