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Home › Buick › 2019 › Envision Base › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Vehicle Access System › Diagnostic Information and Procedures › Power Door Child Lock Malfunction › Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function: Child Security Lock Motors - On

    Verify the correct operation:

    • Interior Door Handle @ Left Rear Door - Disabled
    • Interior Door Handle @ Right Rear Door - Disabled
    • If the component does not work as specified 

      Refer to: Circuit/System Testing - Test 1

    • If none of the components work properly 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the component works as specified 
  3. Perform the scan tool control function: Child Security Lock Motors - Off

    Verify the correct operation:

    • Interior Door Handle @ Left Rear Door - Enabled
    • Interior Door Handle @ Right Rear Door - Enabled
    • If the component does not work as specified 

      Refer to: Circuit/System Testing - Test 1

    • If none of the components work properly 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the component works as specified 
  4. Perform the scan tool control function: Child Security Lock Motors - On

    Verify the correct operation:

    • S79LR Window Switch - Left Rear - Disabled
    • S79RR Window Switch - Right Rear - Disabled
    • If the component does not work as specified 

      Refer to: Circuit/System Testing - Test 3

    • Go to next step: If the component works as specified 
  5. Operate the component: Child Security Lock Switch @ S79D Window Switch - Driver - Pressed

    Verify the scan tool parameter: Child Security Lock/Window Lockout Switch = On and Off

    • If the parameter state does not change 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If the parameter state changes 
  6. All OK.
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