Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The smart junction box (SJB) sends a voltage signal to the hood ajar switch through circuit 1304 (VT/OG). When the hood is closed, the hood ajar switch routes the signal to ground through circuit 57 (BK)