SEAT TRACK POSITION SENSOR
DESCRIPTION
The seat track position sensor (2) is a Hall Effect-type sensor used on some vehicles. This sensor consists of a Hall Effect Integrated Circuit (IC) chip encased in potting material within a cavity of the molded plastic sensor housing.
The sensor housing has a mounting slot containing an integral latch feature (1) and slides and latches onto a stamped metal blade-type bracket located on the inboard side of the upper outboard seat adjuster track near the rear of both the passenger and driver front seats. A molded connector receptacle (3) integral to the sensor housing is connected to the vehicle electrical system through a connector and take out of the seat wire harness beneath the front seat cushion frame.
The seat track position sensor cannot be adjusted or repaired and, if ineffective or damaged, the entire sensor must be replaced.
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 or passenger 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, and sends messages over the CAN data bus to illuminate 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 OCM 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. 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.
REMOVAL
WARNING: To avoid serious or fatal injury, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
1. Disconnect and isolate the battery negative cable. Wait two minutes for the system capacitor to discharge before further service.
2. Reach under the front seat cushion to access the seat track position sensor (2) on a bracket located on the outboard side near the rear of the upper outboard seat track (3).
3. Using a small screwdriver, hold the latch feature (4) depressed while sliding the connector end of the sensor off of the bracket.
4. Disconnect the seat wire harness connector (1) from the sensor connector receptacle.
5. Remove the sensor from under the front seat.
INSTALLATION
WARNING: To avoid serious or fatal injury, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
1. Reach under the front seat cushion to reconnect the seat wire harness connector (1) to the seat track position sensor (2) connector receptacle. Be certain that the latch on the connector is fully engaged.
2. Align the open end of the sensor to the slide tab of the sensor bracket located on the outboard side near the rear of the upper outboard seat track (3).
3. Push the sensor firmly onto the bracket until the latch feature (4) snaps into place with an audible click.
4. Do not reconnect the battery negative cable at this time. The supplemental restraint system verification test procedure should be performed following service of any supplemental restraint system component. (Refer to 8 - ELECTRICAL/RESTRAINTS - STANDARD PROCEDURE - VERIFICATION TEST).