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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. 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. If Instrument Panel Cluster (IPC) is functioning properly, go to next step. If IPC is not functioning properly, go to step  17.
  3. Turn ignition off. Observe AIR BAG warning light while turning ignition on. If AIR BAG warning light flashes 7 times, go to next step. If AIR BAG warning light does not flash 7 times, go to step  17.
  4. Connect scan tool to Data Link Connector (DLC), located under left side of instrument panel. Using scan tool, request IPC DTC display. If DTC U1088 is displayed, inspect data link communications circuits. If DTC U1088 is not displayed, go to next step.
  5. Using scan tool, command AIR BAG warning light on. If AIR BAG warning light comes on, go to next step. If AIR BAG warning light does not come on, go to step  17.
  6. Using scan tool, request SIR DATA LIST display. If ignition voltage is more than 9 volts, go to next step. If ignition voltage is 9 volts or less, go to step  8.
  7. If ignition voltage is more than 16 volts, check battery and charging system. Go to step  18. If ignition voltage is 16 volts or less, go to step  16.
  8. Turn ignition off. Disconnect SDM connector. Inspect connector for signs of damage or corrosion. If connector is damaged, go to next step. If connector is okay, go to step  10.
  9. Replace SDM connector. See WIRE REPAIR . Go to step  18.
    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.
  10. Disable SIR system. See ZONE 8  under DISABLING & ACTIVATING AIR BAG SYSTEM. Disconnect SDM connector. See Figure. Measure resistance of Yellow wire between SDM connector terminal A1 and SIR fuse block C2 terminal F5. If resistance is more than 2 ohms, go to next step. If resistance is 2 ohms or less, go to step  12.
  11. Repair high resistance in circuit 1139. See WIRE REPAIR . Go to step  18.
  12. Turn ignition on. Measure voltage between battery side of SIR fuse and ground. If voltage is not near 12 volts, go to next step. If voltage is near 12 volts, go to step  14.
  13. Repair open or high resistance in voltage feed circuit to SIR fuse. See WIRE REPAIR . Go to step  18.
  14. Measure resistance of circuit 1751 between SDM connector terminal A18 and ground. If resistance is more than 2 ohms, go to next step. If resistance is 2 ohms or less, go to step  16.
  15. Repair open or high resistance in circuit 1751. See WIRE REPAIR . Go to step  18.
  16. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Reconnect all SIR components. Ensure all components are properly mounted. Clear all SIR DTC's. Go to SIR DIAGNOSTIC SYSTEM CHECK .
  17. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Go to next step.
  18. Reconnect all SIR components. Ensure all components are properly mounted. Go to SIR DIAGNOSTIC SYSTEM CHECK .
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