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Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 GMC C3500 HD, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. 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 IPC is functioning correctly, go to next step. If IPC is not functioning correctly, diagnose and repair IPC.
  3. Turn ignition off. Observe AIR BAG warning light while turning ignition on. If AIR BAG warning light does not flash 7 times, go to next step. If AIR BAG warning light does flash 7 times, go to step  10.
  4. Turn ignition off. Install scan tool to Data Link Connector, (DLC), located below driver-side instrument panel. Turn ignition on. If scan tool indicates ignition voltage is more than 9 volts, go to next step. If ignition voltage is 9 volts or less, go to step  6.
  5. If ignition voltage is more than 16 volts, inspect vehicle charging system. If ignition voltage is 16 volts or less, go to step  8.
    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.
  6. Turn ignition off. Check Yellow wire between SDM connector terminal A1 and fuse block connector terminal A5 for an open or high resistance. In 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.
  7. Check voltage feed circuit from battery to AIR BAG fuse for an open or high resistance. If an open or high resistance is found, go to step  13. If an open or high resistance is not found, go to next step.
  8. Check Black/White wire between SDM connector terminal A18 and ground for and open or high resistance. 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.
  9. Disconnect SDM connector. Inspect SDM connector for corrosion or damage. If corrosion or damage is found, replace SDM connector. See WIRE REPAIR . Go to step  13. If corrosion or damage is not found, go to step  11.
  10. Disconnect IPC connector. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Inspect IPC connector for corrosion or damage. If IPC connector is damaged or corroded, replace connector. Go to step  13. If IPC connector is okay, go to step  12.
  11. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to step  13.
  12. Replace Instrument Panel Cluster (IPC). See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Go to next step.
  13. Reconnect all SIR components. Go to SYSTEM OPERATION CHECK .
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