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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 B0040: Driver Head Impact Air Bag Deployment Loop Resistance Low >> 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 head impact air bag module connector located above left rear corner of headliner. 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  9. If head impact air bag module side of connector is damaged, go to step  8.
  4. Install SIR Driver/Passenger Load Tool (SA9409Z-A) to head impact air bag harness connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0040 is retrieved, go to next step. If DTC B0040 is not retrieved, go to step  8.
    NOTE: Use Digital Multimeter (SA911141NE) and Connector Test Adapter Kit (SA9206Z) when performing electrical tests.
  5. Turn ignition off. Remove load tool from harness connector. Disconnect SDM harness connector. See Figure. Measure resistance between SDM connector terminals A5 and A6. If resistance is not infinite, go to next step. If resistance is infinite, go to step  7.
  6. Repair short between circuits 2137 and 2138. See WIRE REPAIR . Go to step  9.
  7. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to step  9.
  8. Replace driver head impact air bag module. See AIR BAG MODULES  under REMOVAL & INSTALLATION. Go to next step
  9. 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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