Safety Belt Buckle Switch
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
As part of the supplemental restraint system (SRS), the driver safety belt buckle is equipped with a safety belt buckle switch. The safety belt buckle switch indicates to the restraints control module (RCM) whether the driver safety belt is buckled or unbuckled.