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Home >> Buick >> 2017 >> Encore Base >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> Power Windows Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition On/Vehicle In Service Mode
  2. Perform the scan tool control function: Driver Window Motor Up & Down

    Verify the component operates in both directions: M74D Window Motor - Driver

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • If the specified state 
  3. Operate the component: Driver Left Front Window Switch - Pressed & Pulled

    Verify the component works as specified: M74D Window Motor - Driver = Up/Express Up/Down/Express Down

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 2

    • If the specified state 
  4. S79D Window Switch - Driver Not Pressed

    Verify the scan tool parameter:

    • Left Rear Window Main Control Down Switch = Inactive
    • Left Rear Window Main Control Express Switch = Inactive
    • Left Rear Window Main Control Up Switch = Inactive
    • Right Rear Window Main Control Down Switch = Inactive
    • Right Rear Window Main Control Express Switch = Inactive
    • Right Rear Window Main Control Up Switch = Inactive
    • Front Passenger Window Main Control Down Switch = Inactive
    • Front Passenger Window Main Control Express Switch = Inactive
    • Front Passenger Window Main Control Up Switch = Inactive
    • If not the specified state 

      Test or replace the component: S79D Window Switch - Driver

    • If the specified state 
  5. Operate the component: S79D Window Switch - Driver Left Rear Window Switch - Pressed & Pulled

    Verify the scan tool parameter:

    • Left Rear Window Main Control Down Switch = Active
    • Left Rear Window Main Control Express Switch = Active
    • Left Rear Window Main Control Up Switch = Active
    • If not the specified state 

      Test or replace the component: S79D Window Switch - Driver

    • If the specified state 
  6. Operate the component: S79D Window Switch - Driver Right Rear Window Switch - Pressed & Pulled

    Verify the scan tool parameter:

    • Right Rear Window Main Control Down Switch = Active
    • Right Rear Window Main Control Express Switch = Active
    • Right Rear Window Main Control Up Switch = Active
    • If not the specified state 

      Test or replace the component: S79D Window Switch - Driver

    • If the specified state 
  7. Operate the component: S79D Window Switch - Driver Right Front Window Switch - Pressed & Pulled

    Verify the scan tool parameter:

    • Front Passenger Window Main Control Down Switch = Active
    • Front Passenger Window Main Control Express Switch = Active
    • Front Passenger Window Main Control Up Switch = Active
    • If not the specified state 

      Test or replace the component: S79D Window Switch - Driver

    • If the specified state 
  8. Perform the scan tool control function: Passenger Window Motor Up & Down

    Verify the component works as specified: M74P Window Motor - Passenger = Up & Down

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 3

    • If the specified state 
  9. Perform the scan tool control function: Left Rear Window Motor Up & Down

    Verify the component works as specified: M74LR Window Motor - Left Rear = Up & Down

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 3

    • If the specified state 
  10. Perform the scan tool control function: Right Rear Window Motor Up & Down

    Verify the component works as specified: M74RR Window Motor - Right Rear = Up & Down

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 3

    • If the specified state 
  11. All OK.
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