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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 335 (Lighting System - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC B198F or B1990 >> 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 B22 Brake Pedal Position Sensor is used to sense the action of the driver application of the brake pedal. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the K9 Body Control Module (BCM) sends a serial data message to the K219 Lighting Control Module to illuminate the stop lamps. The Lighting Control Module responds by applying voltage to the left stop lamp control circuit 7542 and the right stop lamp control circuit 7541 as well as the center high mounted stop lamp (CHMSL) control circuit 820 illuminating the left and right stop lamps and the CHMSL.

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