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Circuit Description

WARNING: This page is about a different car, the 2003 Buick Rendezvous. 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 fuse block in center console. When ignition is turned on, SDM responds by checking SIR system for malfunctions while commanding Instrument Panel Cluster (IPC) to flash AIR BAG warning light 7 times. If no malfunctions are found in SIR system, AIR BAG warning light will turn off.

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