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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 304 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0012 or B0013 >> Circuit/System Verification

Circuit/System Verification

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NOTE:
  • Refer to SIR Service Precautions .
  • Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
    • Driver steering wheel air bag
    • Driver steering wheel air bag coil
    • Inflatable restraint sensing and diagnostic module
    • Air bag wiring harness connector
    • Inflatable restraint sensing and diagnostic module wiring harness connector
  • The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.
  • If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.
  1. Verify the appropriate scan tool Deployment Loop Resistance parameters stay consistently between 2.1-4.0 Ω without any spikes or dropouts while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.
    • If less than 2.1 Ω or greater than 4.0 Ω 

      Refer to Circuit/System Testing below.

    • If there are spikes or dropouts 

      Replace the steering wheel air bag coil.

    • If between 2.1-4.0 Ω without any spikes or dropouts 
  2. Verify DTC B0012 or B0013 is only set as a history DTC.
    • If the DTC is set as current 

      Refer to Circuit/System Testing below.

    • If the DTC is set as history 
  3. Verify the scan tool Deployment Loop Resistance parameters stay consistently between 2.1-4.0 Ω without any drop outs or spikes while moving the harness near each connector listed below.
    • Steering wheel air bag coil
    • Steering wheel air bag.
    • Any inline harness connector
    • Inflatable restraint sensing and diagnostic module
    • If the reading is erratic while moving the harness, perform the following 
    • Inspect each connector terminal for damage or corrosion and repair as necessary.
    • Apply Nyogel lubricant 760G to each connector terminal.
    • Ensure each connector and CPA is correctly seated.
    • If between 2.1-4.0 Ω without any spikes or dropouts 
  4. All OK.
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