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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 11 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC TESTSDTC B0040: DRIVER SIDE DEPLOYMENT LOOP RESISTANCE LOWDIAGNOSTIC PROCEDURE
2004 Oldsmobile Bravada RWD

Diagnostic Procedure

2004 Oldsmobile Bravada RWDSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2000 Buick Park Avenue. 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 impact air bag Yellow 2-pin connector located under driver seat. See Figure. If harness connector is damaged or corroded, go to next step. If harness connector is okay, go to step  4.
  3. Replace damaged wire harness. Go to step  10.
  4. Reconnect driver side impact air bag Yellow 2-pin connector. Ensure CPA clip is installed correctly. Turn ignition on. Using scan tool, check for SIR DTCs. If DTC B0040 is retrieved, go to next step. If DTC B0040 is not retrieved, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Disconnect driver side impact front seat air bag Yellow 2-pin connector located under driver seat. See Figure. Install SIR Driver/Passenger Load Tool (J-38715-A) to harness connector. Turn ignition on. Using scan tool, check for SIR DTCs. If DTC B0040 is retrieved, go to step  7. If DTC B0040 is not retrieved, go to next step.
  6. Turn ignition off. Replace driver side impact air bag module. See AIR BAG MODULES  under REMOVAL & INSTALLATION. Go to step  10.
  7. Turn ignition off. Remove SIR Driver/Passenger Load Tool (J-38715-A) from harness connector. Disconnect SDM harness connector. Using Digital Multimeter (J-39200), measure resistance between SDM harness connector terminals No. B1 and B2. See Figure. If resistance is not infinite, go to next step. If resistance is infinite, go to step  9.
  8. Repair short between circuit 2105 and circuit 2106. Go to step  10.
  9. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to next step.
  10. Reconnect all SIR components. Ensure that all components are properly mounted. Clear all SIR DTCs. Go to SIR DIAGNOSTIC SYSTEM CHECK .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.