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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 20 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEMS)DIAGNOSTIC TESTSDTC B0026: DRIVER DEPLOYMENT LOOP OPENDIAGNOSTIC PROCEDURE
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedure

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2000 Chevrolet Corvette. 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. Disconnect driver-side air bag inline 2-pin connector. Check connector for corrosion, damaged terminals or poor connections. If terminals are damaged or corroded, go to next step. If terminals are okay, go to step  4 .
  3. If female side of connector is damaged, wire harness must be replaced. If male side of connector is damaged, replace connector. Go to step  16 .
  4. Reconnect driver-side air bag inline 2-pin connector. Ensure CPA clip is installed correctly. Turn ignition on. Using scan tool, check for SIR DTCs. If DTC B0026 is retrieved, go to next step. If DTC B0026 is not retrieved, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Disconnect 2-pin and 4-pin inline air bag connectors. Install SIR Driver-Passenger Load Tool (J-38715-A) in 2-pin inline connector. Turn ignition on. Using scan tool, check for SIR DTCs. If DTC B0026 is retrieved, go to step  9 . If DTC B0026 is not retrieved, go to next step.
  6. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A) from 2-pin line connector. Reconnect 2-pin connector halves. Connect SIR Driver-Passenger Load Tool (J-38715-A) to SIR coil-to-air bag module connector. Turn ignition on. Using scan tool, check for SIR DTCs. If DTC B0024 is retrieved, go to step  8 . If DTC B0024 is not retrieved, go to next step.
  7. Turn ignition off. Replace driver-side air bag. See AIR BAG MODULES  under REMOVAL & INSTALLATION. Go to step  16 .
  8. Turn ignition off. Replace SIR coil. See SIR COIL ASSEMBLY  under REMOVAL & INSTALLATION. Go to step  16 .
  9. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A) from harness connectors. Disconnect SDM harness connector. Inspect for proper connection at SDM harness connector terminals No. A6 and A7. See Figure . If terminals are damaged or corroded, go to next step. If terminals are okay, go to step  11 .
  10. Replace SDM harness connector. Go to step  16 .
  11. Using Digital Multimeter (J-39200), measure resistance between 2-pin driver-side air bag inline harness connector terminal "B" and SDM connector terminal No. A6. See Figure & Figure . If resistance is less than 0.5 ohms, go to step  13 . If resistance is 0.5 ohms or greater, go to next step.
  12. Repair open or high resistance in circuit 347. Go to step  16 .
  13. Measure resistance between driver-side harness connector terminal "A" and SDM connector terminal No. A7. See Figure & Figure . If resistance is 0-0.5 ohms, go to step  15 . If resistance is greater than 0.5 ohms, go to next step.
  14. Repair open or high resistance in circuit 348. Go to step  16 .
  15. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION.Go to next step.
  16. 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.