WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Auxiliary Climate Control - Wiring Diagram (1 Of 3)
Courtesy of FORD MOTOR CO.
Fig 2: Auxiliary Climate Control - Wiring Diagram (2 Of 3)
Courtesy of FORD MOTOR CO.
Fig 3: Auxiliary Climate Control - Wiring Diagram (3 Of 3)