WARNING: This page is about a different car, the 2015 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Horn/Cigar Lighter System Wiring Diagrams (1 Of 6)
Courtesy of FORD MOTOR COMPANY
Fig 2: Horn/Cigar Lighter System Wiring Diagrams (2 Of 6)
Courtesy of FORD MOTOR COMPANY
Fig 3: Horn/Cigar Lighter System Wiring Diagrams (3 Of 6)
Courtesy of FORD MOTOR COMPANY
Fig 4: Horn/Cigar Lighter System Wiring Diagrams (4 Of 6)
Courtesy of FORD MOTOR COMPANY
Fig 5: Horn/Cigar Lighter System Wiring Diagrams (5 Of 6)
Courtesy of FORD MOTOR COMPANY
Fig 6: Horn/Cigar Lighter System Wiring Diagrams (6 Of 6)