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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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 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. 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  9.
    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 1 and fuse block connector terminal A7 for an open or high resistance. In an open or high resistance is found and corrected, go to step  13. See WIRE REPAIR . 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 wire between SDM connector terminal 32 and ground for an 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. 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 IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Go to next step.
  13. Reconnect all SIR components. Ensure all components are installed and connected properly. Go to SYSTEM OPERATION CHECK .
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