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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 977 (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 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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. Disconnect the harness connector at the SDM.
  11. Ignition ON, test for less than 1 volt between the appropriate high circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal A (X1)
    • Steering wheel module coil connector Stage 2 terminal A (X2)
    • If not the specified range, test the circuit for a short to voltage.
  12. Test for less than 1 volt between the appropriate low circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal B (X1)
    • Steering wheel module coil connector Stage 2 terminal B (X2)
    • If not the specified range, test the circuit for a short to voltage.
  13. Ignition OFF, test for infinite resistance between the appropriate high circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal A (X1)
    • Steering wheel module coil connector Stage 2 terminal A (X2)
    • If not the specified range, test the circuit for a short to ground.
  14. Test for infinite resistance between the appropriate low circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal B (X1)
    • Steering wheel module coil connector Stage 2 terminal B (X2)
    • If not the specified range, test the circuit for a short to ground.
  15. Test for less then 1 ohm between the SDM connector and the air bag module connector high circuit.
    • Steering wheel module coil connector Stage 1 terminal A (X1) and SDM terminal 9
    • Steering wheel module coil connector Stage 2 terminal A (X2) and SDM terminal 5
    • If not the specified range, test the circuit for an open/high resistance.
  16. Test for less then 1 ohm between the SDM connector and the air bag module connector low circuit.
    • Steering wheel module coil connector Stage 1 terminal B (X1) and SDM terminal 8
    • Steering wheel module coil connector Stage 2 terminal B (X2) and SDM terminal 4
    • 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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