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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. 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. Connect scan tool to Data Link Connector (DLC), located under left side of instrument panel. Turn ignition on. Using scan tool, request SIR data list display. If ignition voltage is greater than 9 volts, go to next step. If ignition voltage is 9 volts or less, go to step  8.
  3. If ignition voltage is 16 volts or less, go to next step. If ignition voltage is more than 16 volts, inspect battery and charging system. Go to step  13.
  4. Turn ignition off. Disconnect SDM connector. Turn ignition on. If AIR BAG warning light illuminates, go to next step. If AIR BAG warning light does not illuminate, go to step  6.
    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.
  5. Turn ignition off. Measure resistance of Brown wire between SDM terminal A9 and ground. If resistance is infinite, go to step  7. If resistance is not infinite, repair short to ground. See WIRE REPAIR . Go to step  13.
  6. Turn ignition off. Inspect SDM connector. If connector shows signs of corrosion, poor connections or damage, replace SDM connector. See WIRE REPAIR . Go to step  13. If connector is okay, go to step  11.
  7. Inspect Instrument Panel Cluster (IPC) connector. See INSTRUMENT PANEL CLUSTER (IPC) . If connector shows signs of corrosion, poor connections or damage, replace connector. Go to step  13. If connector is okay, go to step  12.
  8. Disable SIR system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Measure resistance of Yellow wire between SDM connector terminal A1 and AIR BAGS fuse connector in instrument panel fuse block, in driver-side kick panel. If an open or high resistance is found and corrected in circuit 1139, go to step  13. If an open or high resistance in not found, go to next step.
  9. Measure resistance of battery feed circuit to AIR BAGS fuse. If an open or high resistance is found and corrected, go to step  13. If an open or high resistance is not found, go to next step.
  10. Measure resistance of Black/White wire between SDM connector terminal A18 and ground. If an open or high resistance is found and corrected, go to step  13. If an open or high resistance is not found, go to next step.
  11. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to step  13.
  12. Repair or replace Instrument Panel Cluster. Go to next step.
  13. Reconnect all SIR system components. Ensure that all components are properly mounted. Go to SIR DIAGNOSTIC SYSTEM CHECK .
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