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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belts >> Diagnostic Information and Procedures >> DTC B1921 >> Circuit/System Description

Circuit/System Description

The seat belt reminder sensor is within the passenger seat cushion and provides an input to the Restraints Control Module (RCM). The Restraints Control Module supplies a low reference circuit and a seat belt reminder sensor signal circuit to determine seated or unseated condition of passenger seat.

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