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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 315 (Seat Belts) >> Diagnostic Information and Procedures >> DTC B1921 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

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.