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 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Refer to appropriate WIRING DIAGRAM ARTICLE, Parking Aid for schematic and connector information.