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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Lighting System - DTC B0655 To DTC B3890) >> Diagnostic Information and Procedures >> DTC B3890: Trailer Backup Lamps >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

The trailer lighting control module receives a serial data message from the body control module (BCM) indicating that the vehicle backup lamps have been activated. The trailer lighting control module responds by applying battery voltage to the trailer backup lamp control circuit illuminating the trailer backup lamps.

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