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Diagnostic Procedure

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. 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. Check instrument cluster for correct operation. Repair or replace instrument cluster as necessary. Go to next step.
  3. Turn ignition off. Check AIR BAG warning light for correct operation. See SYSTEM OPERATION CHECK  . If AIR BAG warning light flashes 7 times, go to step  5 . If AIR BAG warning light does not flash 7 times, go to next step.
  4. Replace instrument cluster and then go to step  18 .
  5. Install scan tool to DLC. Ensure communication between scan tool and instrument cluster exists. Using scan tool, retrieve instrument cluster DTC display list. If DTC U1083 does not exist, go to next step. If DTC U1083 exists, a malfunction exists in data link communications circuit. Inspect and repair or replace appropriate components in data communications system.
  6. Using scan tool, retrieve instrument cluster DTC display list. If AIR BAG warning light is being commanded on, go to next step. If AIR BAG warning light is not being commanded on, go to step  4 .
  7. Using scan tool, retrieve SIR DTC display list. If ignition voltage displayed on scan tool is less than 9 volts, go to next step. If ignition voltage displayed on scan tool is 9-16 volts, go to step  9 .
  8. If ignition voltage is more than 16 volts, repair charging system. If ignition voltage is 16 volts or less, go to step  17 .
  9. Turn ignition off. Disconnect SDM connector. See Figure . Check SDM connector terminals for damage or corrosion. If terminals are okay, go to step  11 . If terminals are damaged or corroded, go to next step.
  10. Replace SDM connector. Go to step  18 .
  11. Remove SDM fuse. Disconnect driver and passenger-side air bag Yellow 2-pin connectors located at base and right-side of steering column. See Figure & Figure . Using Digital Multimeter (J-39200), measure resistance between SDM fuse holder terminal and SDM harness connector terminal No. A1. See Figure . If resistance is 0-2 ohms, go to step  13 . If resistance is not 0-2 ohms, go to next step.
  12. Repair open or high resistance in circuit 1139. Go to step  18 .
  13. Turn ignition on. Using Digital Multimeter (J-39200), measure voltage between input side of SDM fuse ground. If voltage is near 12 volts, go to step  15 . If voltage is not near 12 volts, go to next step.
  14. Repair open or high resistance in power feed circuit to SDM fuse. Go to step  18 .
  15. Using Digital Multimeter (J-39200), measure resistance between terminal No. A18 of SDM harness connector. If resistance is less than 2 ohms, go to step  17 . If resistance is 2 ohms or greater, go to next step.
  16. Repair open or high resistance condition in circuit 851.
  17. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION.Go to next step.
  18. Reconnect all SIR system components. Ensure that all components are properly mounted. Go to SIR DIAGNOSTIC SYSTEM CHECK  .
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