B0084

DTC B0083 or B0084

DTC Descriptors

DTC B0083
- Right Front Seat Position Sensor Circuit

DTC B0084
- Left Front Seat Position Sensor Circuit

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

The inflatable restraint seat position sensor (SPS) is used to determine the proximity of a front driver or passenger seat position with respect to the frontal air bag. The SPS interfaces with the sensing and diagnostic module (SDM). The state of the SPS allows the SDM to disable stage 2 of the frontal air bag for a front seat that is forward of a forward/rearward point in seat track travel. The SPS is a hall effect sensor that is mounted on the outboard seat track of both the driver and passenger seats. The seat track includes a metal bracket that shunts the SPS magnetic circuit creating 2 states of seat position. The shunted state represents a rearward seat position. The non-shunted state represents a forward position. The SPS provides 2 current ranges, one range for the shunted state and a second range for a non-shunted state. These 2 states are inputs to the SDM. State 1 (shunted) being the rearward threshold and state 2 (non-shunted) being the forward threshold. When the SDM receives input from a SPS that state 1 threshold is reached (seat is rearward) the SDM will not disable stage 2 deployment, if required by the deployment sensors. When state 2 threshold is reached (seat is forward) the SDM will disable stage 2 deployment on the side the seat is forward. The SDM monitors the SPS circuit and if a fault is detected the SDM will set codes B0083 or B0084 and defaults to disabling stage 2 frontal deployment. This will only default on the side of the vehicle the sensor has a fault.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0083 for Right Front Seat Position Sensor or B0084 for Left Front Seat Position Sensor
* The SDM detects the SPS circuit amperage is 4 mA or less for 500 milliseconds.
* The SDM detects the SPS circuit amperage is between 8-11 mA for 500 milliseconds.
* The SDM detects the SPS circuit amperage is 18 mA or greater for 500 milliseconds.

Action Taken When the DTC Sets

* The SDM commands the AIR BAG indicator ON via serial data communication.
* The SDM defaults the SPS to seat forward threshold.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Circuit/System Testing

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

* The seat position sensor

* The SDM module

* The seat position sensor wiring harness connector

* The SDM wiring harness connector

Ignition OFF, if DTC B0083 is current, disconnect the right SPS connector. If DTC B0084 is current, disconnect the left SPS connector. Refer to seat position sensor replacement in Repair Instructions for location of connector.

1. Remove the SDM connector.
2. Test the low reference and signal circuits between the SDM and SPS. Verify that a short to voltage, short to ground, or open/low resistance does not exist.

• If any of the above conditions are found make the appropriate repair.

3. Reconnect all SIR components. Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify DTC B0083 or B0084 does not set.

• If DTC B0083 was current replace the right SPS. If DTC B0084 was current replace the left SPS. After replacement refer to Repair Verification.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Inflatable Restraint Seat Position Sensor Replacement
* Refer to Programming and Relearning.Programming and Relearning

Repair Verification

Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify no DTCs are set.

If DTC B0083 or B0084 was current replace the SDM.