• 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

Under certain vehicle events involving an impact or predicted roll over event of sufficient force, the Inflatable Restraint Sensing and Diagnostic Module will apply current through the appropriate deployment loops, commanding deployment of the appropriate airbag(s) and/or Pretensioner(s).

Ignition Voltage=9 to 16 V

Control Circuit=Short to Voltage—For greater than 2 s

Control Circuit=Short to Ground—For greater than 2 s

Control Circuit=Open—For greater than 2 s

Resistance=Greater than 4.2 Ω—For greater than 2 s

Resistance=Less than 1.4 Ω—For greater than 2 s

Air Bag Malfunction Indicator=On

• 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

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

Control Module References

EL-38125-580 - Terminal Release Tool Kit

Note: The condition may be intermittent and require driving the vehicle, then reviewing the snapshot to verify resistance parameters do not drop out or spike. Refer to Testing for Intermittent Conditions and Poor Connections

1. Ignition » On / Vehicle » In Service Mode
2. Verify the appropriate scan tool parameter:Deployment Loop 1–20 Resistance=2.1 to 4.0 Ω
• If not between 2.1 and 4.0 Ω

  Refer to:Circuit/System Testing

• If between 2.1 and 4.0 Ω
3. The condition is not currently present and may be an intermittent fault.

1. Ignition/Vehicle & All vehicle systems » Off
2. Before attempting these procedures, the SIR system must be disabled.
3. Disconnect the appropriate electrical connector:F105 Roof Rail Air Bag
4. Test for greater than 25 Ω between the test points:Control circuit terminal 1&Control circuit terminal 2
• If 25 Ω or less
1. Disconnect the electrical connector:K36 Inflatable Restraint Sensing and Diagnostic Module
2. Test for infinite resistance between the test points:Control circuit terminal 1&Control circuit terminal 2@Component harness
• If less than infinite resistance » Repair the short between the circuits.
• If infinite resistance » Replace the component:K36 Inflatable Restraint Sensing and Diagnostic Module
• If greater than 25 Ω
5. Ignition » On / Vehicle » In Service Mode
6. Test for less than 11 V between the test points:
• Control circuit terminal 1&Ground
• Control circuit terminal 2&Ground
• If 11 V or greater
1. Ignition/Vehicle & All vehicle systems » Off
2. Before attempting these procedures, the SIR system must be disabled.
3. Disconnect the electrical connector:K36 Inflatable Restraint Sensing and Diagnostic Module
4. Ignition » On / Vehicle » In Service Mode
5. Test for less than 1 V between the test points:
• Control circuit terminal 1@Component harness&Ground
• Control circuit terminal 2@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K36 Inflatable Restraint Sensing and Diagnostic Module
• If less than 11 V
7. Ignition/Vehicle & All vehicle systems » Off
8. Before attempting these procedures, the SIR system must be disabled.
9. Test for greater than 25 Ω between the test points:
• Control circuit terminal 1&Ground
• Control circuit terminal 2&Ground
• If 25 Ω or less
1. Before attempting these procedures, the SIR system must be disabled.
2. Disconnect the electrical connector:K36 Inflatable Restraint Sensing and Diagnostic Module
3. Test for infinite resistance between the test points:
• Control circuit terminal 1@Component harness&Ground
• Control circuit terminal 2@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:K36 Inflatable Restraint Sensing and Diagnostic Module
• If greater than 25 Ω
10. Ignition/Vehicle & All vehicle systems » Off
11. Before attempting these procedures, the SIR system must be disabled.
12. Connect a 3 A fused jumper wire between the test points:Control circuit terminal 1&Control circuit terminal 2
13. Ignition » On / Vehicle » In Service Mode
14. Verify the appropriate scan tool parameter:Deployment Loop 1–20 Resistance=Less than 2 Ω
• If 2 Ω or greater
1. Ignition/Vehicle & All vehicle systems » Off
2. Before attempting these procedures, the SIR system must be disabled.
3. Disconnect the electrical connector:K36 Inflatable Restraint Sensing and Diagnostic Module
4. Test for less than 2 Ω between the test points:
• Control circuit terminal 1@Component harness&The other end of the circuit
• Control circuit terminal 2@Component harness&The other end of the circuit
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K36 Inflatable Restraint Sensing and Diagnostic Module
• If less than 2 Ω
15. Ignition/Vehicle & All vehicle systems » Off
16. Before attempting these procedures, the SIR system must be disabled.
17. Connect the electrical connector:F105 Roof Rail Air Bag
18. Ignition » On / Vehicle » In Service Mode
19. Clear the DTCs.
20. Operate the vehicle within the Conditions for Running the DTC.

    Verify the DTC does not set.

• If the DTC sets

  Replace the appropriate component:F105 Roof Rail Air Bag

• If the DTC is not set
21. All OK.

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

• Front and Rear Row Roof Rail Airbag Replacement
• SIR/SRS Wiring Repairs
• For control module replacement, programming, and setup refer to:Control Module References