Air Bag Warning Indicator
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.
The instrument cluster is hardwired to the restraints control module (RCM). If an air bag system concern is detected, a DTC is logged and the RCM provides a ground path to the instrument cluster illuminating the air bag indicator.