The inflatable restraint seat belt tension sensor is a 3-wire potentiometer mounted on the retractor or buckle side of the seat belt and provides an input to the passenger presence system (PPS). When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured through the car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the PPS module. The PPS monitors the seat belt tension sensor circuit and if a fault is detected, DTC 023 will be set. When the PPS detects this DTC, it will notify the customer by illuminating either the ON or OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will communicate to the sensing and diagnostic module (SDM) through a non-class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS and will suppress the deployment of the instrument panel (I/P) module and then request the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

Ignition voltage is between 9-16 volts.

Inspect the passenger seat belt tension retractor sensor signal, 5-volt reference, and low reference circuits carefully for cutting and/or chafing.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Important: The seat belt tension retractor sensor is not service separately. The Seat Belt Retractor Replacement - Right Front with the seat belt tension retractor sensor must be serviced as a complete unit.

1. Ignition OFF, disconnect the harness connector at the inflatable restraint passenger seat belt tension sensor.
2. Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal A and ground.

⇒	If less that the specified range, test the voltage reference circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the PPS module.

⇒	If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the PPS module.

Important: The SDM/AOS SWITCH AIR BAG fuse that supplies ignition voltage must be removed to ensure the PPS module is inactive. An active PPS module may cause inaccurate resistance readings.

3. Ignition OFF, remove the SDM/AOS SWITCH AIR BAG fuse. Test for less than 2 ohms between low reference terminal B and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PPS module.

4. Ignition OFF, disconnect the harness connector at the PPS module.
5. Test for infinite resistance between the signal circuit terminal C and ground.

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

6. Ignition ON, test for less than 1 volt between the signal circuit terminal C and ground.

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

7. Test for less than 1 ohm between the signal circuit terminal C at the sensor harness connector and terminal 4 at the PPS module harness connector.

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

8. If all circuits test normal, replace the seat belt tension sensor.
9. Reconnect all PPS components. Clear all PPS DTCs. Refer to Passenger Presence System Flash Code Procedures. Rezero the PPS, refer to Passenger Presence System Rezeroing. Verify DTC 023 does not exist.

⇒	If DTC 023 is set, replaced the PPS.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.