• 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=On
• Ignition Voltage=9 to 16 V

Impact Sensor Circuit=Short to Ground—For greater than 10 s

Impact Sensor Circuit=Open—For greater than 10 s

Impact Sensor Circuit=Open/High Voltage—For greater than 10 s

Impact Sensor Circuit=Internal Malfunction

Impact Sensor Circuit—Identification Information=Invalid

Impact Sensor Circuit=Invalid Serial Data

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.

Refer to SIR Service Precautions.

Refer to SIR Disabling and Enabling.

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with a reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections.

Terminal fretting, damaged terminals, damaged connectors, or incorrectly seated connectors can cause an open/high resistance condition. Check the circuit terminals for fretting or incorrectly seated connector if a DTC with symptom byte 04 or 08 is set.

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 the following conditions do not exist:Symptom Byte:{39, 3A}
• If the specified state

  Replace the appropriate component:

• B59 Front Impact Sensor
• B63 Side Impact Sensor
• If not the specified state
3. Verify the following conditions do not exist:Symptom Byte:{02, 04, 05, 71}
• If the specified state

  Refer to: Circuit/System Testing

• If no DTC is set
4. All OK.

1. Ignition/Vehicle OFF and all vehicle systems powered down.
2. Disconnect the appropriate electrical connector:B59 Front Impact SensororB63 Side Impact Sensor
3. Test for less than 10 Ω between the test points: Low Reference terminal 2&Ground
• If 10 Ω or greater
1. Disable the SIR system. Refer to SIR Disabling and Enabling.
2. Disconnect the electrical connector:K36 Inflatable Restraint Sensing and Diagnostic Module
3. Test for less than 2 Ω between the test points:Low Reference circuit@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 10 Ω
4. Connect a digital multimeter to record the voltage (set to min/max) between the test points: Signal circuit terminal 1&Ground»

Note: To protect the circuit, the digital multimeter will only display the circuit voltage for 3 seconds before shutting down.

5. Ignition/Vehicle ON.
6. Verify the digital multimeter displays between 4 V and 9 V
• If less than 4 V
1. Ignition/Vehicle OFF and all vehicle systems powered down.
2. Disable the SIR system. Refer to SIR Disabling and Enabling.
3. Disconnect the electrical connector:K36 Inflatable Restraint Sensing and Diagnostic Module
4. Test for infinite resistance between the test points:Signal circuit&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance
5. Test for less than 2 Ω between the test points:Signal circuit@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 greater than 9 V
1. Ignition/Vehicle OFF and all vehicle systems powered down.
2. Disable the SIR system. Refer to SIR Disabling and Enabling.
3. Disconnect the electrical connector:K36 Inflatable Restraint Sensing and Diagnostic Module
4. Ignition/Vehicle ON.
5. Test for less than 1 V between the test points:Signal circuit terminal 1&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 between 4 and 9 V
7. Ignition/Vehicle OFF and all vehicle systems powered down.
8. Connect all electrical connectors.
9. Enable the SIR system. Refer to SIR Disabling and Enabling.
10. Operate the vehicle within the Conditions for Running the DTC.
11. Verify the DTC does not set.
• If the DTC sets

  Replace the appropriate component:B59 Front Impact SensororB63 Side Impact Sensor

• If the DTC is not set
12. All OK.

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

• Airbag Front End Discriminating Sensor Replacement
• Airbag Side Impact Sensor Replacement
• Airbag Side Impact Rear Sensor Replacement
• For control module replacement, programming, and setup refer to:Control Module References