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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System - DTC B3950 To DTC C0297 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B3950 or B3951: Trailer Left/Right Turn Signal Lamp (Trailer Lighting Control Module) >> Circuit/System Description
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Circuit/System Description

The trailer lighting control module receives a serial data message from the body control module (BCM) indicating that the vehicle left or right turn signal lamp has been activated. The trailer lighting control module responds by applying a pulsating voltage to the appropriate trailer turn signal lamp through their respective control circuit illuminating the desired trailer turn signal lamp.

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