Normal Operation

WARNING: This page is about a different car, the 2009 Ford Mustang. 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 seat is equipped with a seat track position sensor. The seat track position sensor is comprised of integrated circuits called a Hall-effect switch. The seat track position sensor indicates the position of the driver seat, forward or rearward, to the restraints control module (RCM).

The RCM supplies current to the seat track position sensor. Current flows through the switch, both in the forward or rearward seat position to ground. The RCM will sense the difference in this current draw, 6 mA (forward) or 15 mA (rearward), and use this information in determining the deployment rate of the dual-stage driver air bag module. If the RCM detects current out of range, it will set a DTC.

The RCM monitors the driver seat track position sensor circuits. If the RCM detects an open circuit or short to voltage, it will store DTC C1981 in memory and flash lamp fault code (LFC) 49 on the air bag warning indicator.

DTC C1981 Front Driver's Seat Track Position Switch Circuit Fault - If the RCM detects an open or short to battery on the driver seat track position sensor circuit, it will set this DTC.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Seat track position switch
RCM