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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Lighting System - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC B1A58 or B1A59 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition ON.
  2. Verify no related DTCs are set.
    • Go to next step: If a related DTC is not set 
  3. Verify DTC B1A58 49 or B1A59 49 is not set.
    • If DTC B1A58 49 or B1A59 49 is set 
    1. Replace the appropriate E13 Headlamp Assembly.
    • Go to next step: If DTC B1A58 49 or B1A59 49 is not set 
  4. All OK
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