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Home >> Buick >> 2018 >> Regal GS >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System - Diagnostic Information And Procedures (B388B-P0504) And Symptoms >> 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 & OFF when commanding the Left Dedicated Daytime Running Lamp ON and OFF with a scan tool.
    • If the left daytime running lamp does not turn ON and OFF 

      Refer to Circuit/System Testing - Daytime Running Lamps Malfunction.

    • Go to next step: If the left daytime running lamp turns ON and OFF 
  3. Verify the right daytime running lamp turns ON & OFF when commanding the Right Dedicated Daytime Running Lamp ON and OFF with a scan tool.
    • If the right daytime running lamp does not turn ON and OFF 

      Refer to Circuit/System Testing - Daytime Running Lamps Malfunction.

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