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Air Bag Indicator Malfunction

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.
NOTE: For circuit identification, see WIRING DIAGRAMS in AIR BAG RESTRAINT SYSTEMS - CORVETTE article.
  1. If Supplemental Inflatable Restraint (SIR) diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, see appropriate article in lemon-25(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.
  2. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  3. Turn ignition off. Note operation or air bag indicator. Turn ignition on again. If air bag indicator does not flash 7 times, go to next step. If air bag indicator flashes 7 times, go to step  5 .
  4. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. After repairs, recheck system operation.
  5. Connect scan tool to DLC located under steering column. Attempt to establish communications with IPC. Display IPC DTCs. If DTC U1083 is set as current, go to IPC DTC DEFINITIONS  table under SELF-DIAGNOSTIC SYSTEM. If DTC U1083 is not set as current, go to next step.
  6. Display IPC DATA LIST on scan tool. If AIR BAG WARNING LAMP is being commanded ON, go to next step. If AIR BAG WARNING LAMP is not being commanded ON, go to step  4 .
  7. Use scan tool to communicate with Sensing and Diagnostic Module (SDM). Display SIR DATA LIST on scan tool. If displayed ignition voltage is greater than 9 volts, go to next step. If displayed ignition voltage is less than 9 volts, go to step  9 .
  8. If displayed ignition voltage is greater than 16 volts, check charging system for overcharge condition and repair as necessary. See GENERATORS & REGULATORS - CORVETTE article in STARTING & CHARGING SYSTEMS. If displayed ignition voltage is less than 16 volts, go to step  17 .
  9. Turn ignition off. Remove instrument panel accessory trim plate. See INSTRUMENT PANEL ACCESSORY TRIM PLATE & KNEE BOLSTER PANEL  under REMOVAL & INSTALLATION. Remove A/C-heater control panel. Disconnect SDM connector. SDM is located below and right of A/C-heater control panel opening. See Figure . Check SDM connector for damaged or corroded terminals. If damaged terminals or poor connections are found, go to next step. If terminals and connections are okay, go to step  11 .
  10. Replace SDM connector. After repairs, go to step  18 .
  11. Remove SDM fuse No. 16 (15-amp) located in instrument panel electrical center next to BCM under passenger's floor board. Using DVOM, measure resistance of Yellow wire between SDM fuse and SDM connector terminal A1. If resistance is greater than 2 ohms, go to next step. If resistance is less than 2 ohms, go to step 13  .
  12. Repair open or high resistance in Yellow wire. After repairs, go to step  18 .
  13. Turn ignition off. Using DVOM, measure voltage between SDM fuse battery feed and ground. If battery voltage is not indicated, go to next step. If battery voltage is indicated, go to step  15 .
  14. Repair open or high resistance in battery feed to SDM fuse. See POWER DISTRIBUTION article in WIRING DIAGRAMS. After repairs, go to step  18 .
  15. Using DVOM, measure resistance between ground and SDM connector terminal A18 (Black/White wire). If resistance is greater than 2 ohms, go to next step. If resistance is less than 2 ohms, go to step  17 .
  16. Repair open or high resistance in Black/White wire between SDM and Splice Pack SP208 located at rear of right wheelwell, between battery and underhood electrical center. After repairs, go to step  18 .
  17. Replace SDM. See AIR BAG RESTRAINT SYSTEMS - CORVETTE article. After repairs, go to next step.
  18. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. See appropriate article in lemon-25(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.
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