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B0084




DTC B0083 or B0084

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0083
- Passenger Seat Position Sensor Circuit

DTC B0084
- Driver Seat Position Sensor Circuit

Diagnostic Fault Information






Circuit/System Description

The 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 (Inflatable Restraint Sensing and Diagnostic Module). The state of the SPS allows the Inflatable Restraint Sensing and Diagnostic Module 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 Inflatable Restraint Sensing and Diagnostic Module. State 1 (shunted) being the rearward threshold and state 2 (non-shunted) being the forward threshold. When the Inflatable Restraint Sensing and Diagnostic Module receives input from a SPS that state 1 threshold is reached (seat is rearward) the Inflatable Restraint Sensing and Diagnostic Module will not disable stage 2 deployment, if required by the sensors. When state 2 threshold is reached (seat is forward) the Inflatable Restraint Sensing and Diagnostic Module will disable stage 2 deployment on the side the seat is forward. The Inflatable Restraint Sensing and Diagnostic Module monitors the SPS circuit and if a fault is detected the Inflatable Restraint Sensing and Diagnostic Module 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 Passenger Seat Position Sensor or B0084 Driver Seat Position Sensor

* The Inflatable Restraint Sensing and Diagnostic Module detects the SPS circuit amperage is 4 mA or less for 500 milliseconds.

* The Inflatable Restraint Sensing and Diagnostic Module detects the SPS circuit amperage is between 8-11 mA for 500 milliseconds.

* The Inflatable Restraint Sensing and Diagnostic Module detects the SPS circuit amperage is 18 mA or greater for 500 milliseconds.

Action Taken When the DTC Sets

* The Inflatable Restraint Sensing and Diagnostic Module requests the Instrument Cluster to illuminate the AIR BAG indicator.

* The Inflatable Restraint Sensing and Diagnostic Module defaults the SPS to seat forward threshold.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views 5 Bow Lowered Switch (CM7)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

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

* Seat position sensor

* Inflatable Restraint Sensing and Diagnostic Module

* Seat position sensor wiring harness connector

* Inflatable Restraint Sensing and Diagnostic Module wiring harness connector

1. Ignition OFF, disconnect the applicable seat position sensor connector.

2. Disconnect the harness connector at the Inflatable Restraint Sensing and Diagnostic Module.

3. Ignition ON, test for less than 1 volt between the seat position sensor signal circuit terminal A and ground.

• If greater than the specified range, test the circuit for a short to voltage.

4. Ignition ON, test for less than 1 volt between the applicable seat position sensor low reference circuit terminal B and ground.

• If greater than the specified range, test the circuit for a short to voltage.

5. Test for infinite resistance between the seat position sensor signal circuit terminal A and ground.

• If less than the specified range, test the circuit for a short to ground.

6. Test for infinite resistance between the seat position sensor low reference circuit terminal B and ground.

• If less than the specified value, test the circuit for a short to ground.

7. Test for less then 1 ohm of resistance between the following seat position sensor signal circuit terminals.

* Passenger seat position sensor terminal A and Inflatable Restraint Sensing and Diagnostic Module harness connector terminal 25.

* Driver seat position sensor terminal A and Inflatable Restraint Sensing and Diagnostic Module harness connector terminal 24.

• If greater than the specified range, test the circuit for an open/high resistance.

8. Test for less then 1 ohm between the following seat position sensor low reference circuit terminals.

* Passenger seat position sensor terminal B and Inflatable Restraint Sensing and Diagnostic Module harness connector terminal 11.

* Driver seat position sensor terminal B and Inflatable Restraint Sensing and Diagnostic Module harness connector terminal 11.

• If greater than the specified range, test the circuit for an open/high resistance.

9. If all circuits test normal, replace the applicable seat position sensor.

10. Reconnect all SIR components. Ignition ON, with a scan tool clear and recheck for DTCs.

• If the seat position sensor DTC returns and is current, replace the Inflatable Restraint Sensing and Diagnostic Module.

Repair Instructions

* Inflatable Restraint Seat Position Sensor Replacement Service and Repair

* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs

* Control Module References Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, setup, and programming

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 Inflatable Restraint Sensing and Diagnostic Module.

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