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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Lighting System - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC B1994 or B1995 >> Circuit/System Description

Circuit/System Description

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When the low beam headlamps are ON and the Turn Signal Switch is placed in the high beam position, ground is applied to the BCM through the high beam signal circuit. The BCM responds to the input by sending a serial data message to the Lighting Control Module. The Lighting Control Module then sends a pulse width modulated voltage signal to the headlamp assembly. The headlamp assembly responds by illuminating the respective high beam LEDs.

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