Test T: Seat Track Position Sensor Circuit Fault (DTC C1981): Description
WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
Restraints Control Module (RCM) monitors left front seat position switch circuits for faults. If RCM detects a short to battery, it will store DTC C1981 in memory and flash Code 49 on AIR BAG warning light.