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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 334 (Lighting System) >> Diagnostic Information and Procedures >> DTC B3806: High Beam and Headlamp Flash Select Circuit Malfunction >> Actions Taken When the DTC Sets

Actions Taken When the DTC Sets

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

With T4A 

The high beam headlamps and the high beam indicator on the instrument cluster are always ON.

With T4F 

The high beam headlamps are inoperative.

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