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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 591 (Anti-Lock Brake System) >> Diagnostic Information & Procedures >> DTC C0275 or C0276: EBCM Detects Internal Malfunction >> Circuit Description

Circuit Description

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The YSC relay supplies battery voltage to 4 valve solenoids (priming, charging, supply and YSC). The EBCM microprocessor applies the grounds needed in order to activate each solenoid. The low side of each solenoid coil has a feedback circuit to the EBCM microprocessor. When a solenoid is commanded OFF, the feedback voltage is high. When a solenoid is commanded ON, the feedback voltage is low.

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