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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> 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 Cadillac ATS. 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 upper left front park lamp LED's turn ON and OFF when commanding the Left Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the upper left front park lamp LED's do not turn ON and OFF 

      Refer to Park Lamps Malfunction - Front Upper and Lower LED's.

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

      Refer to Park Lamps Malfunction - Front Upper and Lower LED's.

    • If the upper right front park lamp LED's turn ON and OFF 
  5. Verify the lower left front park lamp LED's turn ON and OFF when commanding the Left Lower Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the lower left front park lamp LED's do not turn ON and OFF 

      Refer to Park Lamps Malfunction - Front Upper and Lower LED's.

    • If the lower left front park lamp LED's turn ON and OFF 
  6. Verify the lower right front park lamp LED's turn ON and OFF when commanding the Right Lower Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the lower right front park lamp LED's do not turn ON and OFF 

      Refer to Park Lamps Malfunction - Front Upper and Lower LED's.

    • If the lower right front park lamp LED's turn ON and OFF 
  7. Verify the left park/marker/tail lamps turn ON and OFF when commanding the Left Park Lamps ON and OFF with a scan tool.
    • If the left park/marker/tail lamps do not turn ON and OFF 

      Refer to Park Lamps Malfunction - Rear.

    • If the left park/marker/tail lamps turn ON and OFF 
  8. Verify the right park/marker/tail lamps turn ON and OFF when commanding the Right Park Lamps ON and OFF with a scan tool.
    • If the right park/marker/tail lamps do not turn ON and OFF 

      Refer to Park Lamps Malfunction - Rear.

    • If the right park/marker/tail lamps turn ON and OFF 
  9. 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 
  10. All OK.
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