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HOMESERVICE MANUALSCHEVROLET2025SUBURBAN LS, RWDREPAIR AND DIAGNOSISBODY & FRAMEFIXED AND MOVEABLE WINDOWSDIAGNOSTIC INFORMATION AND PROCEDURESPOWER WINDOWS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2025 Chevrolet Suburban LS, RWD

Circuit/System Verification

2025 Chevrolet Suburban LS, RWDSECTION Circuit/System Verification
  1. Ignition - On / Vehicle - In Service Mode
  2. Operate the component: Driver Window Switch @ S79D Front Side Door Window Control Switch-Driver - Pressed & Pulled

    Verify the component works as specified:

    • M74D Front Side Door Window Regulator Motor-Driver = Up
    • M74D Front Side Door Window Regulator Motor-Driver = Express Up
    • M74D Front Side Door Window Regulator Motor-Driver = Down
    • M74D Front Side Door Window Regulator Motor-Driver = Express Down
    • If the component does not work as specified 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the component works as specified 
  3. Operate the component: S79P Front Side Door Window Switch - Passenger - Pressed & Pulled

    Verify the component works as specified:

    • M74P Front Side Door Window Regulator Motor-Passenger = Up
    • M74P Front Side Door Window Regulator Motor-Passenger = Express Up
    • M74P Front Side Door Window Regulator Motor-Passenger = Down
    • M74P Front Side Door Window Regulator Motor-Passenger = Express Down
    • If the component does not work as specified 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the component works as specified 
  4. Operate the component: Window Lockout Switch - Pressed

    Verify the scan tool parameter: Left Rear Window Lockout Status = Inactive & Active

    • If the parameter does not change 

      Replace the component: S79D Front Side Door Window Control Switch-Driver

    • Go to next step: If the parameter changes 
  5. Window Lockout Switch = Not Activated
  6. Operate the component: S79LR Rear Side Door Window Switch-Left - Pressed & Pulled

    Verify the component works as specified:

    • M74LR Rear Side Door Window Regulator Motor-Left = Up
    • M74LR Rear Side Door Window Regulator Motor-Left = Down
    • 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 
  7. Operate the component: Window Lockout Switch - Pressed

    Verify the scan tool parameter: Right Rear Window Lockout Status = Inactive & Active

    • If the parameter does not change 

      Replace the component: S79D Front Side Door Window Control Switch-Driver

    • Go to next step: If the parameter changes 
  8. Window Lockout Switch = Not Activated
  9. Operate the component: S79RR Rear Side Door Window Switch-Right - Pressed & Pulled

    Verify the component works as specified:

    • M74RR Rear Side Door Window Regulator Motor-Right = Up
    • M74RR Rear Side Door Window Regulator Motor-Right = Down
    • If the component does not work as specified 

      Refer to: Circuit/System Testing - Test 4

    • Go to next step: If the component works as specified 
  10. Operate the component: Left Rear Window Switch @ S79D Front Side Door Window Control Switch-Driver - Pressed & Pulled

    Verify the component works as specified:

    • M74LR Rear Side Door Window Regulator Motor-Left = Up
    • M74LR Rear Side Door Window Regulator Motor-Left = Down
    • If the component does not work as specified 

      Replace the component: S79D Front Side Door Window Control Switch-Driver

    • Go to next step: If the component works as specified 
  11. Operate the component: Right Rear Window Switch @ S79D Front Side Door Window Control Switch-Driver - Pressed & Pulled

    Verify the component works as specified:

    • M74RR Rear Side Door Window Regulator Motor-Right = Up
    • M74RR Rear Side Door Window Regulator Motor-Right = Down
    • If the component does not work as specified 

      Replace the component: S79D Front Side Door Window Control Switch-Driver

    • Go to next step: If the component works as specified 
  12. Operate the component: Passenger Window Switch @ S79D Front Side Door Window Control Switch-Driver - Pressed & Pulled

    Verify the component works as specified:

    • M74P Front Side Door Window Regulator Motor-Passenger = Up
    • M74P Front Side Door Window Regulator Motor-Passenger = Express Up
    • M74P Front Side Door Window Regulator Motor-Passenger = Down
    • M74P Front Side Door Window Regulator Motor-Passenger = Express Down
    • If the component does not work as specified 

      Replace the component: S79D Front Side Door Window Control Switch-Driver

    • Go to next step: If the component works as specified 
  13. A fault that is not currently present may have been caused by a intermittent condition.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.