Pinpoint Test F: DTC B1891 - Air Bag Tone Warning Indicator Circuit Short to Battery: Notes
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Refer to SYSTEM WIRING DIAGRAMS (Escape) or SYSTEM WIRING DIAGRAMS (Mariner) for schematic and connector information.