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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System - Diagnostic Information And Procedures >> Diagnostic Information And Procedures >> DTC B3410 Or B3420: Headlamp Leveling Control Module Front/Rear Axle Sensor Signal Circuit >> Repair Instructions

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Headlamp Control Module replacement, programming, and setup

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