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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC B0026: Driver Frontal Deployment Loop Open >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK .
  2. Turn ignition off. Disconnect driver-side air bag module connector, located at base of steering column. See Figure. If harness connector is damaged or corroded, go to next step. If harness connector is okay, go to step  4.
  3. If harness side of connector is damaged, replace connector. See WIRE REPAIR . Go to step  14. If SIR coil side of connector is damaged, go to step  12.
  4. Turn ignition off. Install SIR Driver/Passenger Load Tool (SA9409Z-A) to driver-side air bag harness connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0026 is retrieved, go to next step. If DTC B0026 is not retrieved, go to step  10.
    NOTE: Use Digital Multimeter (SA911141NE) and Connector Test Adapter Kit (SA9206Z) when performing electrical tests.
  5. Turn ignition off. Remove SIR Driver/Passenger Load Tool (SA9409Z-A) from harness connector. Disconnect SDM harness connector. See Figure. Measure resistance of White wire between SDM connector terminal A1 and driver-side air bag harness connector terminal "A". If resistance is one ohm or less, go to step  7. If resistance is more than one ohm, go to next step.
  6. Repair open or high resistance in circuit 347. See WIRE REPAIR . Go to step  14.
  7. Measure resistance of Dark Green wire between SDM connector terminal A2 and driver-side air bag harness connector terminal "B". If resistance is one ohm or less, go to step  9. If resistance is more than one ohm, go to next step.
  8. Repair open or high resistance in circuit 348. See WIRE REPAIR . Go to step  14.
  9. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to step  14.
  10. Turn ignition off. Remove driver-side air bag module. See AIR BAG MODULES  under REMOVAL & INSTALLATION. Measure resistance between lower SIR coil connector terminal "A" and upper SIR coil connector terminal "A". If resistance is one ohm or less, go to next step. If resistance is more than one ohm, go to step  12.
  11. Measure resistance between lower SIR coil connector terminal "B" and upper SIR coil connector terminal "B". If resistance is one ohm or less, go to step  13. If resistance is more than one ohm, go to next step.
  12. Replace SIR coil assembly. See SIR COIL ASSEMBLY  under REMOVAL & INSTALLATION. Go to step  14.
  13. Replace driver-side air bag. See AIR BAG MODULES  under REMOVAL & INSTALLATION. Go to next step.
  14. Reconnect all SIR components. Ensure that all components are properly mounted. Using scan tool, clear all SIR DTC's. Go to SIR DIAGNOSTIC SYSTEM CHECK .
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