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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 460 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Air Bag Warning Light Circuit Malfunction >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Ignition switch supplies ignition voltage to Sensing and Diagnostic Module (SDM) connector terminal A1 via SIR fuse, located in under hood fuse block, above left wheel well. When ignition is turned on, SDM commands Instrument Panel Cluster (IPC) to flash AIR BAG warning light 7 times, during which time SDM checks SIR system for malfunctions. If no malfunctions are present, SDM will command IPC to turn AIR BAG warning light off.

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