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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B257C or B257D: Headlamp Assembl >> Circuit/System Verification

Circuit/System Verification

  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 the DTC does not set.
      • If the DTC sets, replace the appropriate E13 Headlamp Assembly.
      • If the DTC does not set
    3. All OK.
    • If DTC B257C or B257D is not set 
  3. All OK
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