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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 150 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC TESTSDTC B0077, B0079, B0080: DRIVER-SIDE SIS VALID IDENTIFICATION MESSAGE NOT RECEIVED/DRIVER-SIDE SIS IDENTIFICATION ERROR/DRIVER-SIDE SIS NOK MESSAGEDIAGNOSTIC PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Diagnostic Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo and 2002 Chevrolet Impala. 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. Using scan tool, request SIR DTC display. If DTC B0079 or B0080 is retrieved as a current DTC, go to step  10. If DTC B0079 or B0080 is not retrieved as a current DTC, go to next step.
  3. Disconnect SIS sensor connector. See SIDE IMPACT SENSOR (SIS)  under REMOVAL & INSTALLATION. If connector is damaged or corroded, go to next step. If connector is okay, go to step  5.
  4. If SIS side of connector is damaged, replace SIS. Go to step  11. If harness side of connector is damaged, replace connector. See WIRING DIAGRAMS . Go to step  11.
  5. Disconnect SDM connector. See Figure. If SDM connector or SDM terminals show signs of corrosion, poor connections or other damage, go to next step. If SDM connector and terminals are okay, go to step  7.
  6. If SDM connector is damaged, replace connector. See WIRE REPAIR . Go to step  11. If SDM terminals are damaged, go to step  12.
    NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat Wire Probe Adapter Kit (J-42675) when performing electrical tests.
  7. Test SIS circuits for an open or high resistance. If open or high resistance is found and corrected, go to step  11. If open or high resistance is not found, go to next step.
  8. Inspect SIS circuits for a short between voltage and signal circuits. If short is found and corrected, go to step  11. If short is not found, go to next step.
  9. Turn ignition on. Check SIS circuits for a short to voltage. If condition is found and corrected, go to step  11. If condition is not found, go to next step.
  10. Replace SIS. Go to next step.
  11. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to next step. If DTC's are not retrieved, system is normal.
  12. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to next step.
  13. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC is retrieved, go to step  2. If DTC is not retrieved, system is normal. 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.