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Home >> Chevrolet >> 2019 >> Suburban 3500 HD LS >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System - Diagnostic Information And Procedures (DTC B3950-C0297) >> Diagnostic Information and Procedures >> Daytime Running Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the left daytime running lamps turns ON and OFF while commanding the Left Dedicated Daytime Running Lamp ON and OFF with a scan tool.
    • If the left daytime running lamps do not turn ON and OFF 

      Refer to Daytime Running Lamp Malfunction.

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

      Refer to Daytime Running Lamp Malfunction.

    • Go to next step: If the right daytime running lamps turn ON and OFF 
    4. NOTE:

    Placing a towel over the ambient light sensor can simulate a dim light condition and shining an incandescent light at the ambient light sensor can simulate a bright light condition.

  4. Verify the scan tool Ambient Light Status parameter changes while switching from dim to bright ambient light conditions
    • If the parameter does not change 

      Refer to Ambient Light Sensor Malfunction.

    • Go to next step: If the parameter changes 
  5. A fault is not currently present and may be an intermittent condition.
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