WARNING: This page is about a different car, the 2015 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Passive Anti-Theft System Wiring Diagram (1 Of 3)
Courtesy of FORD MOTOR COMPANY
Fig 2: Passive Anti-Theft System Wiring Diagram (2 Of 3)
Courtesy of FORD MOTOR COMPANY
Fig 3: Passive Anti-Theft System Wiring Diagram (3 Of 3)