How do I get the running lights to work

On my 2012 Nissan Frontier? I have been to the dealer twice, they can not answer my question. All other lights work. I am using the OEM cable at the rear of the truck. Their tech checked out my vehicle and said the 3 relays under the hood were alresdy installed. I went there this morning and they said to look on line under nissan-techinfo.com. I did, it only gives the information on a 2005 truck.