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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0012 or B0013 >> Circuit/System Testing

Circuit/System Testing

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    IMPORTANT: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
    • The steering wheel coil module
    • The SDM module
    • The steering wheel coil module wiring harness connector
    • The SDM wiring harness connector
  1. Ignition OFF, disconnect steering wheel module. Then use J 38715-120 adapter to connect the J 38715-A  to the upper steering wheel coil module in-line wiring harness connectors. See Special Tools . Use the PASSENGER INFLATOR and STEERING COLUMN connectors located on the load tool.
  2. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012 or B0013 are set current.
    • If DTC B0012 or B0013 is history replace the steering wheel module.
  3. Ignition OFF, disconnect the steering wheel coil module in-line connector.
  4. Use J 38715-80 adapter to connect the J 38715-A  to the harness side of the steering wheel coil module in-line wiring harness connector. See Special Tools . Use the PASSENGER INFLATOR and BASE of COLUMN connectors located on the load tool.
  5. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012 or B0013 are set current.
    • If DTC B0012 or B0013 is history replace the steering wheel coil module.
  6. Ignition OFF, disconnect and remove the J 38715-A  and adapter. See Special Tools . Then remove the SDM connector. Refer to SDM replacement  in Repair Instructions for connector location.
  7. Test the high and low circuits between the SDM and steering wheel coil module for a short to voltage, short to ground, or open/low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.
    • If any of the above conditions are found make the appropriate repair.
  8. If all circuits test normal then replace the SDM.
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