Normal Operation

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 safety belt warning indicator is controlled by the instrument cluster based upon the safety belt status received from the restraints control module (RCM). When the driver safety belt is unbuckled, the safety belt switch closes, providing a ground signal to the RCM through circuit 85 (BN/LB). When the passenger safety belt is unbuckled, the safety belt switch closes, providing a ground signal to the RCM through circuit 1514 (RD/BK). When either the driver or passenger safety belts are buckled, the safety belt switch opens, removing the ground path to the RCM. The RCM, monitoring the safety belt status, provides a ground to the instrument cluster through circuit 1083 (LB/BK) when the safety belt switch is closed (unbuckled).

Possible Causes

Circuit 1083 (LB/BK) open, short to ground or voltage
RCM
Instrument cluster