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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 B1A58 or B1A59 >> 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.

Each headlamp assembly has internal logic that monitors the components within the headlamp assembly. When a fault within the headlamp assembly is detected, the K9 Body Control Module will set the appropriate DTC against the appropriate headlamp assembly.

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