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.
Circuit/System Verification
- Vehicle Power Mode - Run/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 = Down
- M74D Front Side Door Window Regulator Motor - Driver = Express Down
- M74D Front Side Door Window Regulator Motor - Driver = Express Up
- 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 = 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
- If The Parameter Does Not Change
- 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
- M74Lr Rear Side Door Window Regulator Motor - Left = Express 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
- If The Parameter Does Not Change
- 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
- M74Rr Rear Side Door Window Regulator Motor - Right = Express 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
- M74Lr Rear Side Door Window Regulator Motor - Left = 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
- 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
- M74Rr Rear Side Door Window Regulator Motor - Right = 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
- 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 = 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.
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.