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GMC
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2011
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Acadia SL, AWD
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Repair and Diagnosis (Single Page)
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Accessories & Equipment
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Headlights
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Lighting System
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Diagnostic Information and Procedures
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DTC B257A
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Action Taken When the DTC Sets
Action Taken When the DTC Sets
The BCM disregards the headlamp switch input and defaults to automatic headlamp function.