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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1544 (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 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 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 to the following requires repair or replacement of the affected component/connector:
  • Driver steering wheel air bag
  • Driver steering wheel coil
  • SDM module
  • Driver steering wheel air bag wiring harness connector
  • Driver steering wheel coil wiring harness connector
  • SDM wiring harness connector

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 driver steering wheel air bag connector and CPA are engaged.
    • If the above condition is not found, make the appropriate repair.
  2. Ignition OFF, disconnect the harness connector at the driver steering wheel air bag.
  3. With the appropriate load tool adaptor, connect J 38715-A  in place of the driver steering wheel air bag. See Special Tools .
  4. Ignition ON, with a scan tool, verify the appropriate 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  , reconnect the harness connector at the driver steering wheel air bag, and cycle the ignition ON. See Special Tools . If the DTC resets after reconnecting the air bag, then replace the driver steering wheel air bag.
  5. Ignition OFF, disconnect J 38715-A  and the adaptor. See Special Tools .
  6. Disconnect the driver steering wheel air bag coil in-line connector.
  7. With the appropriate load tool adaptor, connect special tool J 38715-A  . See Special Tools .
  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 driver steering wheel air bag coil.
  9. Ignition OFF, disconnect special tool J 38715-A  and the adaptor. See Special Tools .
  10. Disconnect the harness connector at the SDM.
  11. Ignition ON, test for less than 1 volt between the high circuit terminals listed below and ground.
    • Driver steering wheel air bag coil connector Stage 1 terminal A1 X275
    • Driver steering wheel air bag coil connector Stage 2 terminal B1 X275
    • If greater than the specified range, test the circuit for a short to voltage.
  12. Test for less than 1 volt between the low circuit terminals listed below and ground.
    • Driver steering wheel air bag coil connector Stage 1 terminal A2 X275
    • Driver steering wheel air bag coil connector Stage 2 terminal B2 X275
    • If greater than the specified range, test the circuit for a short to voltage.
  13. Ignition OFF, test for infinite resistance between the high circuit terminals listed below and ground.
    • Driver steering wheel air bag coil connector Stage 1 terminal A1 X275
    • Driver steering wheel air bag coil connector Stage 2 terminal B1 X275
    • If less than the specified value, test the circuit for a short to ground.
  14. Test for infinite resistance between the low circuit terminals listed below and ground.
    • Driver steering wheel air bag coil connector Stage 1 terminal A2 275
    • Driver steering wheel air bag coil connector Stage 2 terminal B2 X275
    • If less than the specified value, test the circuit for a short to ground.
  15. Test for less then 1 ohm between the SDM connector and the air bag connector high circuit terminals listed below.
    • Driver steering wheel air bag coil connector Stage 1 terminal A1 X275 and SDM terminal 4 X1.
    • Driver steering wheel air bag coil connector Stage 2 terminal B1 X275 and SDM terminal 1 X1.
    • If greater than 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 connector low circuit terminals listed below.
    • Driver steering wheel air bag coil connector Stage 1 terminal A2 X275 and SDM terminal 3 X1
    • Driver steering wheel air bag coil connector Stage 2 terminal B2 X275 and SDM terminal 2 X1
    • If greater than the specified range, test the circuit for an open/high resistance.
  17. If all circuits test normal, replace the SDM.
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