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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 334 (Lighting System) >> 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 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Park Lamps Switch parameter changes between Active and Inactive while commanding the park lamps ON and OFF with the turn signal/multifunction switch.
    • If the parameter does not change 

      Refer to Turn Signal/Multifunction Switch Malfunction.

    • If the parameter changes 
  3. Verify the left front park lamps turn ON and OFF when commanding the Left Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the left front park lamps do not turn ON and OFF 

      Refer to Park Lamps Malfunction.

    • If the left front park lamps turn ON and OFF 
  4. Verify the right front park lamps turn ON and OFF when commanding the Right Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the right front park lamps do not turn ON and OFF 

      Refer to Park Lamps Malfunction.

  5. Verify the left rear park lamps turn ON and OFF when commanding the Left Park Lamp ON and OFF with a scan tool.
    • If the left rear park lamps do not turn ON and OFF 

      Refer to Park Lamps Malfunction.

    • If the left rear park lamps turn ON and OFF 
  6. Verify the right rear park lamps turn ON and OFF when commanding the Right Park Lamp ON and OFF with a scan tool.
    • If the right rear park lamps do not turn ON and OFF 

      Refer to Park Lamps Malfunction.

    • If the right rear park lamps turn ON and OFF 
  7. Verify the license plate lamps turn ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool.
    • If the license plate lamps do not turn ON and OFF 

      Refer to License Plate Lamps Malfunction.

    • If the license plate lamps turn ON and OFF 
  8. (With T4A/T4F/T7E), verify the left park/daytime running lamp turns ON and OFF when commanding the Left Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the left park/daytime running lamp turns ON and OFF 
  9. (With T4A/T4F/T7E), verify the right park/daytime running lamp turns ON and OFF when commanding the Right Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the right park/daytime running lamp turns ON and OFF 
  10. All OK.
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