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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 >> Rear Compartment Lamp Malfunction >> Circuit/System Verification

Circuit/System Verification

Without TC2

  1. Ignition ON.
  2. Verify the scan tool Liftgate Rear Close Switch parameter changes between Inactive to Active when pressing the B70 Liftgate Close Switch.
    • If the parameter does not change 

      Refer to Circuit/System Testing

    • Go to next step: If the parameter does change 

      Go to next step: Refer to Circuit/System Testing

With TC2

  1. Ignition - On / Vehicle - In Service Mode
  2. Operate the component:Liftgate - Closed

    Verify the scan tool parameter:Rear Closure Ajar Switch=Inactive

    • Go to next step: If the specified state 
  3. Operate the component:Liftgate - Ajar

    Verify the scan tool parameter:Rear Closure Ajar Switch=Active

    • Go to next step: If the specified state 

      Go to next step: Refer to: Circuit/System Testing