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Sensing & Diagnostic Module (SDM): Notes

WARNING: This page is about a different car, the 1995 Pontiac Firebird and 1995 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

Vehicles not equipped with a DERM are equipped with a Sensing and Diagnostic Module (SDM).

SDM contains a sensing device which converts vehicle velocity changes to an electrical signal. The electrical signal generated is processed by SDM and compared to a value stored in memory. When generated signal exceeds stored value, additional signal processing is performed, and generated signals are compared to value stored in memory. When 2 generated signals exceed stored values, or when one generated signal exceeds stored value and forward discriminating sensor closes, SDM will close circuit, providing voltage to inflator module.

SDM is designed to provide following functions in SIR system:

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