i have a 2016 nissan frontier desert runner and i replaced the window motor regulator and switch on the passenger side and it still will not work ... what could it be?

Hello, do all the other windows work? Does the power door lock in the passenger door work? The two things I would look at: Occasionally the master switch on the driver's door will prevent the passenger motor and switch from working due to a fault. (Also make sure the window lock isn't engaged -- that might mean there's nothing wrong!) Also, a wiring issue to the door itself may prevent power from getting to the motor. have you checked the wiring for power and ground and signal? Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops