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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B3891: Trailer Fog Lamps Circuit >> 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 rear fog lamp have been activated. The trailer lighting control module responds by applying battery voltage to the trailer fog lamp control circuit illuminating the trailer fog lamps.

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