Safety Belt Warning Indicator
WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The RCM monitors the safety belt position through the safety belt switch (part of the buckle). The RCM communicates the status of the safety belt switch to the instrument cluster through hardwired circuitry. When the safety belt is unbuckled, the safety belt switch closes to ground, signaling the RCM that the safety belt is unbuckled. The RCM provides a ground signal to the instrument cluster to turn on the safety belt warning indicator. When the safety belt is buckled, the safety belt switch opens to the RCM and the RCM in turn removes the ground to the instrument cluster to turn off the safety belt warning indicator.