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Circuit Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests to diagnose critical internal malfunctions. SDM provides input power to driver-side Electronic Frontal Sensor (EFS). When input power is detected, EFS responds by performing internal diagnostics. EFS then sends an identification message to SDM. SDM will consider identification message to be valid if received within 5 seconds of EFS powering up. EFS continually communicates a status message to SDM. SDM can reset EFS by removing and reapplying power to EFS.

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