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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Daytime Running Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  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 Ambient Light Sensor Malfunction.
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