Pinpoint Test B: DTCs C1700, C1703, C1706 And C1709 - Parking Aid Sensor Circuit Failure or Blockage: Notes
WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Refer to appropriate SYSTEM WIRING DIAGRAMS article, Parking Aid for schematic and connector information.