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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 B258C or B258D: Left/Right Headlamp Control Circuit 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 B258C or B258D is not set.
    • If DTC B258C or B258D is set 
    1. Program the K26 Headlamp Control Module.
    2. Verify the DTC does not set.
      • If DTC B258C or B258D is set 

        Replace the T7 Headlamp Ballast.

    3. Verify the DTC does not set.
      • If DTC B258C or B258D is set 

        Replace the E4 Headlamp - Low Beam.

    4. Verify the DTC does not set.
      • If DTC B258C or B258D is set 

        Replace the K26 Headlamp Control Module.

      • If DTC B258C or B258D does not set 
    5. All OK
    • If DTC B258C or B258D does not set 
  3. All OK
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