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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraints >> Diagnostic Information and Procedures >> DTC B0012 or B0013 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: When removing connectors inspect for damage, corrosion or poor connection. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
  • The pretensioner
  • The air bag module
  • The SDM module
  • The air bag wiring harness connector
  • The SDM wiring harness connector
  1. Verify that the steering wheel module connector and the connector position assurance (CPA) are engaged.
    IMPORTANT: The connector and 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.
    • If the above condition is found, make the appropriate repair.
  2. Ignition OFF, disconnect the steering wheel module.
  3. With the appropriate adaptor, connect special tool J 38715-A  .
  4. Ignition ON, with a scan tool, verify DTC is set as current.
    • If DTC is not set or is set as history, replace the steering wheel module.
  5. Ignition OFF, disconnect special tool J 38715-A  .
  6. Disconnect the steering wheel module coil in-line connector.
  7. With the appropriate adaptor, connect special tool J 38715-A  .
  8. Ignition ON, with a scan tool, verify DTC is set as current.
    • If DTC is not set or is set as history, replace the steering wheel module coil.
  9. Ignition OFF, disconnect special tool J 38715-A  and the appropriate adaptor.
  10. Ignition ON, test for less than 1 volt between the high control circuit steering wheel module coil connector stage 1 terminal 1 (X1) and ground.
    • If not the specified range, test the circuit for a short to voltage.
  11. Test for less than 1 volt between the low control circuit steering wheel module coil connector stage 1 terminal 2 (X1) and ground.
    • If not the specified range, test the circuit for a short to voltage.
  12. Ignition OFF, test for infinite resistance between high control circuit steering wheel module coil connector stage 1 terminal 1 (X1) and ground.
    • If not the specified range, test the circuit for a short to ground.
  13. Disconnect the harness connector at the SDM.
  14. Test for infinite resistance between the low control circuit steering wheel module coil connector stage 1 terminal 2 (X1) and ground.
    • If not the specified range, test the circuit for a short to ground.
  15. Test for less then 1 ohm between the high control circuit SDM connector terminal 9 and the steering wheel module coil connector stage 1 terminal 1 (X1).
    • If not the specified range, test the circuit for an open/high resistance.
  16. Test for less then 1 ohm between the low control circuit SDM connector terminal 8 and the steering wheel module coil connector stage 1 terminal 2 (X1)
    • If not the specified range, test the circuit for an open/high resistance.
  17. If all circuits test normal, replace the SDM.
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