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 a 3-wire potentiometer mounted on the buckle side of the seat belt 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 car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the Passenger Presence Module. The Passenger Presence Module monitors the seat belt tension sensor circuit and if a fault is detected, DTC 023 will be set. When the Passenger Presence Module 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 Passenger Presence Module will communicate with the Inflatable Restraint Sensing and Diagnostic Module through a non-class 2 communications circuit that a Passenger Presence Module fault is present. The Inflatable Restraint Sensing and Diagnostic Module will then set DTC B0092 indicating a problem within the Passenger Presence Module and will suppress the deployment of the passenger instrument panel air bag and then request the Instrument Cluster to illuminate the AIR BAG indicator.
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 Passenger Presence Module will set a DTC, and then communicate with the Inflatable Restraint Sensing and Diagnostic Module.
* The Inflatable Restraint Sensing and Diagnostic Module will set DTC B0092.
* The Inflatable Restraint Sensing and Diagnostic Module disables the passenger instrument panel air bag deployment loop.
* The Passenger Presence Module will illuminate the PASSENGER AIRBAG status OFF indicator.
* The Inflatable Restraint Sensing and Diagnostic Module requests the Instrument Cluster 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 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: The passenger seat belt tension sensor is not service separately. The passenger seat belt buckle with the seat belt tension sensor must be serviced as a complete unit.
When removing the connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
* Seat belt tension sensor
* Passenger presence module
* Inflatable Restraint Sensing and Diagnostic Module
* Seat belt tension sensor wiring harness connector
* Passenger presence module wiring harness connector
* Inflatable Restraint Sensing and Diagnostic Module wiring harness connector
1. Ignition OFF, disconnect the 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 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 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.
Note: The Inflatable Restraint Sensing and Diagnostic Module/AOS SWITCH 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 Inflatable Restraint Sensing and Diagnostic Module/AOS SWITCH AIRBAG fuse. Test for less than 2 ohms between the passenger seat belt tension sensor 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 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 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 Passenger Presence 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 passenger seat belt tension sensor.
9. Reconnect all Passenger Presence Module components. Clear all Passenger Presence Module DTCs. Refer to Passenger Presence System Flash Code Procedures Component Tests and General Diagnostics. Rezero the Passenger Presence Module, refer to Passenger Presence System Rezeroing Passenger Presence System Rezeroing. Verify DTC 023 does not exist.
• If DTC 023 is set, replaced the Passenger Presence Module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
* Seat Belt Buckle Pretensioner Replacement Removal and Replacement
* Control Module References Control Module References for Passenger Presence Module replacement, setup, and programming