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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> DTC B0100, B0101, B0102: EFS Valid Identification Message Not Received/ EFS NOK Message/EFS Incorrect Identification >> Circuit Description

Circuit Description

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Electronic Frontal Sensor (EFS), also known as a front end discriminating sensor, uses a unidirectional 2-wire circuit. SIS modulates current on the interface to send identification, State Of Health (SOH) and deployment commands to Sensing and Diagnostic Module (SDM). SDM serves as a power source and ground for EFS. When ignition is turned on and EFS detects power from SDM, EFS responds by performing internal diagnostics and sending identification to SDM. SDM considers identification message to be valid if received within 5 seconds of EFS powering up. EFS continually communicates a status message to SDM. When fault is detected, SDM will attempt to reset EFS twice by removing and applying power. If fault is still present, DTC will set.

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