Remove the Communication Cable from the Primary Control Unit by turning the cable nut counterclockwise and gently pulling it out.
​

Repeat this process for the other side of the communication cable which is connected to the Secondary Control Unit.
​

Connect a new communication cable-
Insert the female side to the Primary Control Unit and turn the nut clockwise to lock it. Insert the male side into the Secondary Control Unit and turn the nut clockwise to tighten it.