• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

Symptom Byte Information:Symptom Byte List

For an overview of the component/system, refer to:Supplemental Inflatable Restraint System Description and Operation

Ignition/Vehicle ON.

Ignition/Vehicle voltage is between 9–16 V.

• Passenger Seat Belt Tension Sensor—Signal circuit=Less than .5 VorGreater than 4.5 V
• Passenger Seat Belt Tension Sensor—Low Reference circuit=Greater than 25 mA

The above condition(s) must occur for greater than 1 s.

System State=Disabled

• A current DTC will clear when the diagnostic runs and passes.
• A history DTC will clear after 50 consecutive malfunction-free ignition cycles.

SIR Schematics

Master Electrical Component List

For an overview of the component/system, refer to:Supplemental Inflatable Restraint System Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC B0071 is not set
• If the DTC is set

  Refer to: Circuit/System Testing

• If the DTC is not set
3. All OK.

Note:

• Refer to:SIR Service Precautions
• Refer to:SIR Disabling and Enabling.
• Inspect the terminals of the following components and connectors for damage or corrosion and repair or replace as necessary:
• B61P Seat Belt Tension Sensor - Passenger
• K36 Inflatable Restraint Sensing and Diagnostic Module
• Inline Harness Connector
• Always test the harness side when circuit testing deployment loops.
• Never test a component on a deployment loop with the DVOM.
• The connector position assurance (CPA) should seat with an audible and/or tactile click, for vehicles equipped with shorting bars the CPA isolates the shorting-bars (if equipped) within the connector allowing the deployment circuit to operate properly.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:B61P Seat Belt Tension Sensor - Passenger
3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 1&Ground
• If 10 Ω or greater
1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:K85 Passenger Presence Module
3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 1@Component harness&The other end of the circuit@Control module harness
• If 10 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 10 Ω » Replace the component:K85 Passenger Presence Module
• If less than 10 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Test for less than 6 V between the test points:Signal circuit terminal 2&Ground
• If 6 V or greater
1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:K85 Passenger Presence Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:Signal circuit terminal 2@B61P Seat Belt Tension Sensor - Passenger&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K85 Passenger Presence Module
• If less than 6 V
6. Ignition/Vehicle & All vehicle systems » Off
7. Test for greater than 5 kΩ between the test points:Signal circuit terminal 2&Ground
• If 5 kΩ or less
1. Disconnect the electrical connector:K85 Passenger Presence Module
2. Test for infinite resistance between the test points:Signal circuit terminal 2@B61P Seat Belt Tension Sensor - Passenger&Ground
• If less than infinite resistance » Repair the short between the circuits.
• If infinite resistance » Replace the component:K85 Passenger Presence Module
• If greater than 5 kΩ
8. Disconnect the electrical connector:K85 Passenger Presence Module
9. Test for less than 2 Ω between the test points:Signal circuit terminal 2@B61P Seat Belt Tension Sensor - Passenger&The other end of the circuit@Control module harness
• If 2 Ω or greater

  Repair the open/high resistance in the circuit.

• If less than 2 Ω
10. If all conditions test normal»Replace the appropriate component:B61P Seat Belt Tension Sensor - Passenger
11. Operate the vehicle within the Conditions for Running the DTC.
12. Verify DTC B0071 is not set
• If the DTC is set

  Replace the component:K85 Passenger Presence Module

• If the DTC is not set
13. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Front Seat Belt Retractor Replacement—B61P Seat Belt Tension Sensor - Passenger
• SIR/SRS Wiring Repairs
• For control module replacement, programming, and setup refer to:Control Module References