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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 >> Dome Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool Door Ajar Sw. parameter changes between Active and Inactive while opening and closing each vehicle door.
    • If the parameter changes 
  3. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter changes between Door, On, and Cancel while placing the dome lamp switch in the Door, On, and Cancel positions.
    • If the parameter does not change 

      Refer to Dome Lamp Switch Malfunction.

    • If the parameter changes 
  4. Verify the dome/courtesy lamps turn ON and OFF while commanding the Courtesy Lamps ON and OFF with a scan tool.
    • If the dome/courtesy lamps do not turn ON and OFF 

      Refer to Dome/Courtesy Lamps Malfunction.

    • If the dome/courtesy lamps turn ON and OFF 
  5. All OK.
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