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 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 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 of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the passenger presence module will communicate to the inflatable restraint sensing and diagnostic module (SDM) through a serial data communications circuit that a PPS fault is present. The SDM will then set DTC B0081 indicating a problem within the PPS and will suppress the deployment of the passenger instrument panel air bag and then illuminate the AIR BAG warning 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 SDM.
* The SDM will set DTC B0081.
* The SDM disables the passenger instrument panel air bag deployment loop.
* The passenger presence module will illuminate the passenger AIR BAG status OFF indicator.
* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG warning 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.
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)
Circuit/System Testing
Important: The passenger seat belt tension sensor is not service separately. The Seat Belt Retractor Pretensioner Replacement - Right Front with the passenger seat belt tension sensor must be serviced as a complete unit. When removing connectors inspect for damage or corrosion. Damage or corrosion in 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 harness connector at the passenger seat belt tension sensor.
2. Ignition OFF, test for less than 1.0 ohm between the low reference circuit terminal B and ground.
• If not within the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the passenger presence module.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the passenger presence module.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the passenger presence module.
4. Ignition OFF, disconnect the harness connector at the passenger presence module.
5. Ignition OFF, test for infinite resistance between the signal circuit terminal C and ground.
• If not the specified value, test the signal circuit for a short to ground.
6. Ignition ON, test for less than 1.0 volt between the signal circuit terminal C and ground.
• If not within the specified range, test the signal circuit for a short to voltage.
7. Test for less than 1.0 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, test or replace the passenger seat belt tension sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Seat Belt Retractor Pretensioner Replacement - Front (Removal and Replacement)
* Control Module References (Programming and Relearning)for passenger presence module replacement, setup, and programming