Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
The ignition switch START circuit provides fused battery voltage along circuits 1522 (DG) and 1050 (LG/VT) to the smart junction box (SJB) when the key is in the START position.