Seat Position Sensor: Description and Operation
The seat track position sensor is designed to provide a seat position data input to the Occupant Restraint Controller (ORC) indicating whether the driver
side front seat is in a full forward or a not full forward position. The ORC uses this data as an additional logic input for use in determining the
appropriate deployment force to be used when deploying the multistage driver side front airbag.
The seat track position sensor receives a nominal five volt supply from the ORC. The sensor communicates the seat position by modulating the voltage
returned to the ORC on a sensor data circuit. The ORC also monitors the condition of the sensor circuits and will store a Diagnostic Trouble Code
(DTC) for any fault that is detected. The ORC then sends messages over the Controller Area Network (CAN) data bus to control the illumination of the
airbag indicator in the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN).
The hard wired circuits between the seat track position sensor and the ORC may be diagnosed using conventional diagnostic tools and procedures. Refer
to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the seat track position
sensor or the electronic controls and communication between other modules and devices that provide features of the Supplemental Restraint System
(SRS). The most reliable, efficient, and accurate means to diagnose the seat track position sensor or the electronic controls and communication related to
seat track position sensor operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.