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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. Turn ignition off. Disconnect air bag disable switch connector. See PASSENGER-SIDE AIR BAG DISABLE SWITCH  under REMOVAL & INSTALLATION. If connector shows signs of corrosion or damage, repair condition. See WIRE REPAIR . Go to step  11. If connector is okay, go to next step.
  3. Reconnect disable switch connector. Connect scan tool to Data Link Connector (DLC), located under left side of instrument panel. Turn air bag disable switch off. Turn ignition on. Using scan tool, request IP MODULE DISABLE (ACTIVE) SWITCH data parameter. If scan tool indicates that IP MODULE DISABLE (ACTIVE) switch is disabled, go to next step. If scan tool does not indicate that IP MODULE DISABLE (ACTIVE) switch is disabled, go to step  5.
  4. Turn air bag disable switch on. Using scan tool, request IP MODULE DISABLE (ACTIVE) switch data parameter. If a change of state is observed on scan tool, go to DIAGNOSTIC AIDS . If a change of state is not observed, go to next step.
  5. Turn ignition off. Disconnect air bag disable switch connector. Turn ignition on. Using scan tool, request IP MODULE DISABLE (ACTIVE) switch data parameter. If scan tool indicates that switch is disabled, go to step  10. If scan tool does not indicate that switch is disabled, go to next step.
    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. Check disable switch signal circuit wire for a short to ground or voltage. If short to ground or voltage is found and corrected, go to step  11. If short to ground or voltage is not found and corrected, go to next step.
  7. Check disable switch indicator control circuit wire for a short to ground or voltage. If short to ground or voltage is found and corrected, go to step  11. If short to ground or voltage is not found and corrected, go to next step.
  8. Turn ignition off. Disconnect SDM connector. If SDM connector shows signs of corrosion or damage, replace SDM connector. See WIRE REPAIR . Go to step  11. If SDM connector is okay, go to next step.
  9. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to step  11.
  10. Replace air bag disable switch. See PASSENGER-SIDE AIR BAG DISABLE SWITCH  under REMOVAL & INSTALLATION. Go to next step.
  11. Reconnect all SIR components. Ensure that all components are properly mounted and connected. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC is retrieved, go to step  2. If DTC is not retrieved, system is normal.
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