To program a keyless entry remote for a Nissan Pathfinder, close and lock all doors, insert the key into the ignition, and remove it twice within five seconds. Close and open the driver's door twice, then insert and remove the key once more. Close and open the driver's door twice again, then insert the key and leave it in the ignition. Press any button on the remote to program it, and repeat this step for any additional remotes. Remove the key from the ignition, test the remote's functionality, and ensure it locks and unlocks the vehicle.