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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Lighting System - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> Backup Lamps Malfunction >> Circuit/System Description

Circuit/System Description

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.

With the engine running and the transmission in the reverse position, the transmission control module (TCM) sends a serial data message to multiple control modules including the K9 Body Control Module (BCM). The BCM responds by sending a serial data message to the K219 Lighting Control Module indicating that the gear selector is in the reverse position. The Lighting Control Module responds by applying battery voltage through the backup lamp control circuits illuminating the backup lamps.

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