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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Dome Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  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 Lamp Malfunction.

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