Air Bag Warning Indication
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
The supplemental restraint system is monitored and controlled by the restraint control module (RCM). The status of the supplemental system is sent from the RCM to the instrument cluster through hardwired circuitry. The air bag warning indicator is illuminated if the RCM sends a ground signal to the instrument cluster.