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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 B1048 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

There are vehicles equipped with Dome ON/OFF switch and Dome Defeat switch. When Dome Defeat is ON, the dome lamp operation based on courtesy by BCM is disabled. Dome Defeat indicator will be ON to inform the customers that courtesy is disabled.

To enable courtesy lamp operation by BCM, Dome Defeat should be OFF (Indicator will be OFF)

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