Description And Operation: Description
Vehicles manufactured for the North America Free Trade Agreement (NAFTA) market are equipped with a Seat Track Position Sensor (STPS) for each front seat. The STPS is a Hall-effect sensor designed to provide seat position data to the ORC indicating whether the driver or passenger side front seat is in a full forward or a not full forward position. The Occupant Restraint Controller (ORC) uses the seat guide input as a factor in determining the appropriate force to be used when deploying the multistage driver or passenger airbag.
The seat guide position sensor receives a 5 V signal from the ORC. The sensor communicates the seat position by modulating the voltage returned to the ORC. The ORC monitors the current produced by the modulating voltage. The ORC also monitors the condition of the sensor circuits and will store a DTC for any detected fault and make a request to the Body Control Module (BCM) over CAN-C to switch on the airbag warning light in the instrument panel.
The STPS cannot be adjusted or repaired and, if ineffective or damaged, the entire STPS unit must be replaced.