Question

Does wire A16 (purple/yellow) need to be tapped into wire A10 (lt. blue/black) 2013 Infiniti G37 sedan/evo-nist1?

The wiring diagram for a 2013 Infiniti G37 sedan, using an EVO-NIST1 shows that the A16 (purple/yellow) wire needs to be tapped into A10 (lt. blue/black) wire. 

Im trying to see if this in necessary because both wires are attached to the same connecter. Furthermore, none of the install videos I have found for this set up and vehicle have mentioned connecting these wires to one another. What will happen if it is not connected?