Diagnostic Instructions
DTC Descriptor
DTC 023: Seat Belt Tension Sensor Circuit Out of Range
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
5-Volt Reference
| 023
| 023
| 023
| --
|
Seat Belt Tension Sensor Signal
| 023
| 023
| 023
| --
|
Low Reference
| --
| 023
| --
| --
|
Circuit/System Description
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.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
| • | The PPS detects the voltage at the passenger seat belt tension retractor sensor signal is less than 0.5 volt or greater than 4.5 volts for 500 milliseconds. |
| • | The PPS detects the voltage at the passenger seat belt tension retractor sensor 5-volt reference is less than 4.5 volts or greater than 9.1 volts for 500 milliseconds. |
| • | The PPS detects the amperage at the passenger seat belt tension retractor sensor low reference is 25 ma or greater for 500 milliseconds. |
Action Taken When the DTC Sets
| • | The PPS will set a DTC, and then communicate with the SDM. |
| • | The SDM will set DTC B0092. |
| • | The SDM disables the I/P module deployment loop. |
| • | The PPS will illuminate the PASSENGER AIRBAG status OFF indicator. |
| • | The SDM requests the 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 retractor sensor signal, 5-volt reference, and low reference circuits carefully for cutting and/or chafing.
Reference Information
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
Circuit/System Testing
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.
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 retractor pretensioner - RF |
| • | Seat belt retractor pretensioner - RF wiring harness connector |
| • | PPS wiring harness connector |
| • | SDM wiring harness connector |
- Ignition OFF, disconnect the harness connector at the inflatable restraint passenger seat belt tension sensor.
- 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 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 SCMPSIR SW fuse that supplies ignition voltage must be removed to ensure the PPS module is inactive. An active PPS module may cause inaccurate resistance readings.
- Ignition OFF, remove the SCMPSIR 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 open/high resistance. If the circuit tests normal, replace the PPS module. |
- Ignition OFF, disconnect the harness connector at the PPS module.
- 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. |
- 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. |
- 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. |
- If all circuits test normal, replace the seat belt tension sensor.
- 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. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
