WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Four Wheel Drive Systems Wiring Diagram (1 Of 4)
Courtesy of FORD MOTOR COMPANY
Fig 2: Four Wheel Drive Systems Wiring Diagram (2 Of 4)
Courtesy of FORD MOTOR COMPANY
Fig 3: Four Wheel Drive Systems Wiring Diagram (3 Of 4)
Courtesy of FORD MOTOR COMPANY
Fig 4: Four Wheel Drive Systems Wiring Diagram (4 Of 4)