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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Lighting System - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> Park, License, and/or Tail Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Park Lamp Switch parameter changes between Active and Inactive while turning the park lamps ON and OFF with the Turn Signal Switch.
    • If the parameter does not change 

      Refer to Turn Signal Switch Malfunction.

    • Go to next step: If the parameter changes 
  3. Verify the park/tail lamps turn ON and OFF when commanding the appropriate scan tool control function ON and OFF:
    • Left Front Park Lamp
    • Right Front Park Lamp
    • Left Tail Lamp
    • Right Tail Lamp
    • If one or more of the lamps do not turn ON and OFF 

      Refer to Park Lamps Malfunction.

    • Go to next step: If all of the lamps turn ON and OFF 
  4. Verify the license plate lamp(s) turn ON and OFF when commanding the License Plate Lamp ON and OFF with a scan tool.
    • If the license plate lamps do not turn ON and OFF 

      Refer to License Plate Lamps Malfunction.

    • Go to next step: If the license plate lamps turn ON and OFF 
  5. A fault is not currently present and may be an intermittent condition.
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