The Curt Wiring harness part # C56108 that you referenced is needed to install and use a brake controller on your 2012 Acura ZDX, but there is one more component needed.
You will also need a part number # ETBC7. The Curt harness will control the taillights of your trailer as it is a 4-way. But to install a brake controller you will need a 7-way as well. The # ETBC7 will use the trailer lighting signals from the Curt harness and then also give you the ability to install a brake controller.... view full answer...