It depends. If you have a "plug'n'play" harness for your brake controller that comes with the plug end to directly connect to the Nissan connector under the dash, then "no." If you have a harness with your brake controller that has nothing but 4 wires at the end of it, then "yes." The wires from your controller harness get spliced with the wires on the 24167-A6000 harness, which will then allow your controller to plug into the Nissan under-dash socket.TooTallMike wrote:If my 07 SE w/ 4x4 already has the plug under the dash to connect my brake controller to, do I need 24167-A6000 Wiring Harness - Vehicle Brakes to Trailer Brakes ?