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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1908 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0012 or B0013 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Refer to SIR Service Precautions .
When removing connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
  • Pretensioner
  • Air bag module
  • SDM module
  • Air bag wiring harness connector
  • SDM wiring harness connector
    IMPORTANT: 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.
  1. Verify that the steering wheel module connector and the connector position assurance (CPA) are engaged.
    • If the above condition is found, make the appropriate repair.
  2. Ignition OFF, disconnect the appropriate steering wheel module harness connector.
  3. With the appropriate load tool adaptor, connect special tool J 38715-A  or SA9409Z-A  .
  4. Ignition ON, verify DTC is set as current.
    • If the DTC is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A  or SA9409Z-A  , reconnect the harness connector at the steering wheel module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the steering wheel module.
  5. Ignition OFF, disconnect special tool J 38715-A  or SA9409Z-A  and adaptor.
  6. Disconnect the harness connector at the steering wheel module coil.
  7. Ignition ON, test for less than 1 volt between the appropriate high control circuit listed below and ground:
    • Steering wheel module coil connector Stage 1 terminal 1 X3
    • Steering wheel module coil connector Stage 2 terminal 3 X3
    • If not within the specified range, test the high control circuit for a short to voltage.
  8. Test for less than 1 volt between the appropriate low control circuit listed below and ground:
    • Steering wheel module coil connector Stage 1 terminal 2 X3
    • Steering wheel module coil connector Stage 2 terminal 4 X3
    • If not within the specified range, test the low control circuit for a short to voltage.
  9. Ignition OFF, test for infinite resistance between the appropriate high control circuit listed below and ground:
    • Steering wheel module coil connector Stage 1 terminal 1 X3
    • Steering wheel module coil connector Stage 2 terminal 3 X3
    • If not within the specified range, test the high control circuit for a short to ground.
  10. Test for infinite resistance between the appropriate low control circuit listed below and ground:
    • Steering wheel module coil connector Stage 1 terminal 2 X3
    • Steering wheel module coil connector Stage 2 terminal 4 X3
    • If not within the specified range, test the low control circuit for a short to ground.
  11. Test for less then 1 ohm between the appropriate high control circuit terminals listed below:
    • Steering wheel module coil connector Stage 1 terminal 1 X3 and SDM terminal 9
    • Steering wheel module coil connector Stage 2 terminal 3 X3 and SDM terminal 5
    • If not within the specified range, test the high control circuit for an open/high resistance.
  12. Test for less then 1 ohm between the appropriate low control circuit terminals listed below:
    • Steering wheel module coil connector Stage 1 terminal 2 X3 and SDM terminal 8
    • Steering wheel module coil connector Stage 2 terminal 4 X3 and SDM terminal 4
    • If not within the specified range, test the low control circuit for an open/high resistance. If circuits tests normal replace steering wheel module coil.
  13. If all circuits test normal, replace the SDM.
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