WARNING: This page is about a different car, the 2016 Ford Transit Connect. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Auxiliary Climate Control Wiring Diagram (1 of 6)
Courtesy of FORD MOTOR COMPANY
Fig 2: Auxiliary Climate Control Wiring Diagram (2 of 6)
Courtesy of FORD MOTOR COMPANY
Fig 3: Auxiliary Climate Control Wiring Diagram (3 of 6)
Courtesy of FORD MOTOR COMPANY
Fig 4: Auxiliary Climate Control Wiring Diagram (4 of 6)
Courtesy of FORD MOTOR COMPANY
Fig 5: Auxiliary Climate Control Wiring Diagram (5 of 6)