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 near the 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. Its important to understand that the SPS is secondary to the passenger presence system (PPS) and the manual instrument panel (I/P) module disable switch. If either one of these devices are in the disable mode the passenger air bag will not deploy regardless of the SPS status.

Ignition voltage is between 9-16 volts.

DTC B0083 and B0084 will set when one of the following conditions occur:

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

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

1. Ignition OFF, disconnect the harness connector at the appropriate SPS.
2. Disconnect the harness connector at the SDM.
3. Ignition ON, test for less than 1 volt between the appropriate signal circuit listed below and ground:

•	Driver SPS signal circuit terminal 29.

•	Passenger SPS signal circuit terminal 30.

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

4. Ignition ON, test for less than 1 volt between the low reference circuit terminal 28 and ground.

⇒	If greater than the specified range, test the low reference circuit for a short to voltage.

5. Ignition ON, test for infinite resistance between the appropriate signal circuit listed below and ground:

•	Driver SPS signal circuit terminal 29.

•	Passenger SPS signal circuit terminal 30.

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

6. Test for less than 1 ohm between the appropriate signal circuit terminals listed below:

•	Driver SPS signal circuit terminal 29 at the SDM and terminal A at the sensor.

•	Passenger SPS signal circuit terminal 30 at the SDM and terminal A at the sensor.

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

7. Test for less than 1 ohm between the appropriate low reference circuit terminals listed below:

•	Driver SPS low reference circuit terminal 28 at the SDM and terminal B at the sensor.

•	Passenger SPS low reference circuit terminal 28 at the SDM and terminal B at the sensor.

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

8. If all circuits test normal, replace the SPS and verify that the DTC does not reset.

⇒	If the DTC resets, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.