Air Bag Warning Indicator
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, and 2005 Ford E450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The air bag warning indicator circuit is grounded by the restraint control module (RCM), through a hardwired circuit, when the RCM detects a fault in the air bag system. In addition, the RCM connector contains a shorting bar that grounds the circuit when the connector is disconnected. Failure of the air bag warning indicator to prove out once the ignition switch is turned to the RUN position indicates a fault in the air bag system.