WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Horn Cigar Lighter Circuit Diagram (1 Of 3)
Courtesy of FORD MOTOR CO.
Fig 2: Horn Cigar Lighter Circuit Diagram (2 Of 3)
Courtesy of FORD MOTOR CO.
Fig 3: Horn Cigar Lighter Circuit Diagram (3 Of 3)