DTC 023
DTC 023
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 Descriptor
DTC 023
- Passenger Seat Belt Tension Sensor Circuit Out of Range
Diagnostic Fault Information
Circuit/System Description
The passenger seat belt tension sensor is used to enhance the passenger presence system (PPS) when an infant car seat is properly restrained on the front passenger seat. The passenger seat belt tension sensor is a 3-wire potentiometer mounted on the lower seat belt anchor and provides an input to the passenger presence module. When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured through the infant car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the passenger presence module. The passenger presence module uses the voltage signal to help determine if a tightly belted infant car seat is installed. The passenger presence module uses the inputs from the passenger seat belt tension sensor and the passenger presence sensor to determine if the passenger instrument panel air bag should be suppressed or enabled. The passenger presence module monitors the passenger seat belt tension sensor circuits and sets DTC 023 if a fault is detected.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
* The passenger presence module detects the voltage at the passenger seat belt tension sensor signal is less than 0.5 volt or greater than 4.5 volts for 500 milliseconds.
* The passenger presence module detects the voltage at the passenger seat belt tension sensor 5-volt reference is less than 4.5 volts or greater than 9.1 volts for 500 milliseconds.
* The passenger presence module detects the amperage at the passenger seat belt tension sensor low reference is 25 mA or greater for 500 milliseconds.
Action Taken When the DTC Sets
* The SDM disables the passenger instrument panel air bag deployment loop.
* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
Conditions for Clearing the DTC
* The condition for setting the DTC no longer exists.
* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Diagnostic Aids
Inspect the passenger seat belt tension sensor signal, 5-volt reference, and low reference circuits carefully for cutting and/or chafing.
Reference Information
Schematic Reference
SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
SIR System Description and Operation (Description and Operation)
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 (Programming and Relearning) for scan tool information.
Circuit/System Testing
Important: When removing connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
* Passenger seat belt tension sensor
* Passenger presence module
* Passenger seat belt tension sensor wiring harness connector
* Passenger presence module wiring harness connector
1. Ignition OFF, disconnect the X2 harness connector at the passenger seat belt tension sensor.
2. Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal B X2 and ground.
• If less that the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the passenger presence module.
• If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the passenger presence module.
Important: The AIRBAG fuse that supplies ignition voltage must be removed to ensure the passenger presence module is inactive. An active passenger presence module may cause inaccurate resistance readings.
3. Ignition OFF, remove the AIRBAG fuse. Test for less than 3 ohms between the low reference circuit terminal A X2 and ground.
• If greater than the specified range, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the passenger presence module.
4. Ignition OFF, disconnect the harness connector at the passenger presence module.
5. Test for infinite resistance between the signal circuit terminal 4 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 4 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 terminal 4 and circuit terminal C X2 at the sensor 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 buckle.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Seat Belt Buckle Replacement (Front Seat Belt Buckle Replacement)
* Control Module References (Programming and Relearning) for passenger presence system replacement, setup, and programming