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Home >> Saturn >> 2001 >> SC2 Automatic, MP6 >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Air Bag Restraint Systems >> Diagnostic Tests >> DTC B0040: Driver Head Impact Air Bag Deployment Loop Resistance Low >> Diagnostic Procedure

Diagnostic Procedure

  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 Yellow 2-pin connector located under trim panel. 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 connector is damaged, go to step  8.
  4. Turn ignition off. Install SIR Driver-Passenger Load Tool (SA9409-Z) to head impact air bag harness connector. Turn ignition on. Using scan tool, check for SIR DTCs. If DTC B0040 is set, go to next step. If DTC B0040 is not set, go to step  8.
  5. Turn ignition off. Remove SIR Driver-Passenger Load Tool (SA9409-Z) from harness connector. Disconnect SDM harness connector. See Figure. Using Digital Multimeter (SA911141NE) with Adapter Kit (SA9206Z), measure resistance between SDM harness connector terminals B1 and B2. 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 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 DTCs. Go to SIR DIAGNOSTIC SYSTEM CHECK .
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