Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSCHEVROLET2025SUBURBAN LS, 4WDREPAIR AND DIAGNOSISBODY & FRAMEFIXED AND MOVEABLE WINDOWSDIAGNOSTIC INFORMATION AND PROCEDURESPOWER WINDOWS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION

2025 Chevrolet Suburban LS, 4WD

Circuit/System Verification

2025 Chevrolet Suburban LS, 4WDSECTION Circuit/System Verification

Ignition - On / Vehicle - In Service Mode
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
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
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
Window Lockout Switch = Not Activated
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
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
Window Lockout Switch = Not Activated
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
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
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
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
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.