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Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. 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. Inspect Instrument Panel Cluster (IPC) for proper operation. If IPC is working correctly, go to next step. If IPC is not working correctly, diagnose and repair IPC malfunction.
  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  10.
  4. 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  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. If ignition voltage is more than 16 volts, inspect battery and charging system. If ignition voltage is 16 volts or less, go to step  9.
  6. Turn ignition off. Disconnect SDM connector. See Figure. Check Pink wire between SDM connector terminal No. 1 and SIR fuse for an open or high resistance. See WIRE REPAIR . If an open or high resistance is found and corrected, go to step  12. If an open or high resistance is not found, go to next step.
  7. Check voltage feed wire between AIR fuse and battery for an open or high resistance. See WIRE REPAIR . If an open or high resistance is found and corrected, go to step  12. If an open or high resistance is not found, go to next step.
  8. Check Black/White wire between SDM connector terminal No. 32 and ground for an open or high resistance. See WIRE REPAIR . If an open or high resistance is found and corrected, go to step  12. If an open or high resistance is not found, go to next step.
  9. Inspect SDM connector for damage or signs of corrosion. If connector is damaged, replace connector. See WIRE REPAIR . Go to step  12. If connector is not damaged, go to step  11.
  10. 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  12. If connector is okay, replace IPC. Go to step  12.
  11. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to step  12.
  12. Reconnect all SIR and IPC system components. Ensure that all components are properly mounted. Go to SIR DIAGNOSTIC SYSTEM CHECK .
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