Finally got the tow package on the EX sorted out. Dealer gave me the package which contains a ball mount and pin for the hitch and the connector/pigtail for connecting the electric brake controller. Also, included the installation manual for the tow wiring harness. With these it should be straight forward to install the electric brake controller. According to the manual the electric brake controller plug is under the dash on the driver side. Will check tomorrow as it is dark now.
One item to be aware of, the 12V input to the trailer at the 7 pole connector appears to be hot with the Telluride started or shut off. If the trailer battery is discharged or dead and the trailer is hooked up with the Telluride shut off for a period, the Telluride battery would discharge. Most trailer towing packages put a relay in the 12v line to the trailer that only allows the line to be hot when the Telluride is started/running.
Will check this again to be sure. Planning to install a relay.