When you look at the trailer plug ther will be a blue wire that should be getting 12 volts when you put your vehicle in reverse, if it is getting voltage then you probably have a bad solenoid, if your not getting voltage it will either be a fuse or relay on your truck. It does not matter the brand of vehicle, if yours does not have a towing package it could be missing a relay. The easiest check is to set your parking brake and with the vehicle running put it in reverse and see if you are getting voltage to the blue wire.