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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Lighting System - DTC B0655 To DTC B3890) >> Diagnostic Information and Procedures >> DTC B257C or B257D: Headlamp Assembly Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify DTC B257C or B257D is not set.
    • If DTC B257C or B257D is set 
    1. Program the K26 Headlamp Control Module.
    2. Verify DTC B257C or B257D is not set.
      • If DTC B257C or B257D is set 

        Replace the appropriate E13 Headlamp Assembly.

      • If DTC B257C or B257D is not set 
    3. All OK.
    • If DTC B257C or B257D is not set 
  3. All OK
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