Pinpoint Test G: DTC C1920 and B2373 - LED #1 Circuit Short to Battery & LED #1 Circuit Failure: Notes
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Refer to SYSTEM WIRING DIAGRAMS - E350 SUPER DUTY , Parking Aid for schematic and connector information.