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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 >> Daytime Running 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 left daytime running lamp turns ON and OFF while commanding the Left Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the left daytime running lamp does not turn ON and OFF 

      Refer to Daytime Running Lamps Malfunction.

    • If the left daytime running lamp turns ON and OFF 
  3. Verify the right daytime running lamp turns ON and OFF while commanding the Right Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
    • If the right daytime running lamp does not turn ON and OFF 

      Refer to Daytime Running Lamps Malfunction.

    • If the right daytime running lamp turns ON and OFF 
  4. Refer to Circuit/System Testing - Ambient Light Sensor Malfunction.
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