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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Supplemental Inflatable Restraint System) >> Diagnostics >> Sir Diagnostic System Check >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2002 Buick Park Avenue. 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 underhood fuse block, near battery. When ignition is turned on, SDM responds by performing tests on SIR system while Instrument Panel Cluster (IPC) flashes AIR BAG warning light 7 times. If system is okay, AIR BAG warning light will turn off.

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