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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 446 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0012 or B0013 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the scan tool and disconnect the appropriate harness connector listed below at the steering wheel air bag. It may take up to 2 minutes for all vehicle systems to power down.
    • DTC B0012 connector X1
    • DTC B0013 connector X2
  2. Test for greater than 25 Ω between the control circuit terminal 1 and the control circuit terminal 2.
    • If 25 Ω or less 
    1. Disconnect the X1 harness connector at the inflatable restraint sensing and diagnostic module.
      2. NOTE:

      Some connectors may be equipped with shorting bars as a safety component to prevent accidental inflator deployment. When testing on a connector with shorting bars, the shorting bars must be disabled to ensure accurate test results. Insert an appropriate pick from EL-38125-580 and depress the shorting bars above the appropriate terminals. This will lift the shorting bar from the terminal and allow accurate test results. Take care not to damage the connector, shorting bar, or terminal when depressing the shorting bar.

    2. Test for infinite resistance between the two control circuits.
      • If less than infinite resistance, repair the short between the two circuits.
      • If infinite resistance, replace the inflatable restraint sensing and diagnostic module.
    • If greater than 25 Ω 
  3. Ignition ON.
  4. Test for less than 11 V between each control circuit terminal listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 11 V or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the inflatable restraint sensing and diagnostic module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the inflatable restraint sensing and diagnostic module.
    • If less than 11 V 
  5. Ignition OFF.
  6. Test for greater than 25 Ω between each control circuit terminal listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 25 Ω or less 
    1. Disconnect the X1 harness connector at the inflatable restraint sensing and diagnostic module.
      2. NOTE:

      Some connectors may be equipped with shorting bars as a safety component to prevent accidental inflator deployment. When testing on a connector with shorting bars, the shorting bars must be disabled to ensure accurate test results. Insert an appropriate pick from EL-38125-580 and depress the shorting bars above the appropriate terminals. This will lift the shorting bar from the terminal and allow accurate test results. Take care not to damage the connector, shorting bar, or terminal when depressing the shorting bar.

    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the inflatable restraint sensing and diagnostic module.
    • If greater than 25 Ω 
  7. Install a 3 A fused jumper wire between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
  8. Verify the scan tool Deployment Loop Resistance parameter is consistently less than 2 Ω while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.
    • If the reading is erratic while turning the steering wheel 

      Replace the steering wheel airbag coil.

    • If 2 Ω or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the inflatable restraint sensing and diagnostic module.
    2. Test for less than 2 Ω in the steering wheel airbag coil and each control circuit end to end.
      • If 2 Ω or greater, replace the coil or repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the inflatable restraint sensing and diagnostic module.
    • If less than 2 Ω 
  9. Ignition OFF, connect the harness connector at the steering wheel air bag, press in the CPA (if equipped) until an audible and/or tactile click is heard.
  10. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  11. Verify DTC B0012 or B0013 is not set.
    • If DTC B0012 or B0013 is set 

      Replace the steering wheel air bag.

    • If DTC B0012 or B0013 is not set 
  12. All OK.
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