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Home >> Buick >> 2018 >> Regal Base >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U1112-U1115 >> Circuit/System Description

Circuit/System Description

The Headlamp Leveling Control Modules are connected via a private CAN bus to the Headlamp Control Module. If the Headlamp Control Module cannot communicate with any Headlamp Leveling Control Modules or headlamp actuators, an appropriate DTC will be set.