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
- Ignition ON.
- Verify the driver window functions while commanding the Driver Window Motor Up and Down with a scan tool.
- If the driver window does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Driver/Passenger Window Motor Malfunction.
- If the driver window moves UP and DOWN as commanded
- If the driver window does not move UP and DOWN as commanded
- Verify the driver window functions while commanding the window UP, express UP, DOWN and express DOWN with the S79D Window Switch-Driver.
- If the driver window does not move UP or DOWN as commanded
Refer to Circuit/System Testing - Driver Window Switch Malfunction.
- If the driver window does not express UP or express DOWN
Normalize the M74D Window Motor-Driver, refer to Window Motor Programming - Express Function .
- If after normalization, the driver window does not express UP or express DOWN
Refer to Circuit/System Testing - Driver Window Switch Malfunction.
- If the driver window moves UP, express UP, DOWN and express DOWN as commanded
- If the driver window does not move UP or DOWN as commanded
- Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control;
- Left Rear Main Control Down Switch - Inactive and Active
- Left Rear Main Control Express Switch - Inactive and Active
- Left Rear Main Control Up Switch - Inactive and Active
- Right Rear Main Control Down Switch - Inactive and Active
- Right Rear Main Control Express Switch - Inactive and Active
- Right Rear Main Control Up Switch - Inactive and Active
- Front Passenger Main Control Down Switch - Inactive and Active
- Front Passenger Main Control Express Switch - Inactive and Active
- Front Passenger Main Control Up Switch - Inactive and Active
- If any parameter does not change
Replace the S79D Window Switch-Driver.
- If the parameters change
- Verify the scan tool Child Security Lockout Switch parameter changes between Inactive and Active when pressing the window lockout switch on the S79D Window Switch-Driver.
- If the parameters do not change
Refer to Power Door Child Lock Malfunction
- If the parameters changes
- If the parameters do not change
- Verify the lockout indicator turns ON and OFF when commanding the Child Security Lock Indicator On and Off with a scan tool.
- If the lockout indicator does not turn ON and OFF
Replace the S79D Window Switch-Driver.
- If the lockout indicator turns ON and OFF
- If the lockout indicator does not turn ON and OFF
- Verify the passenger, left rear and right rear window functions while commanding the Passenger Window Motor, Left Rear Window Motor and Right Rear Window Motor Up and Down with a scan tool.
- If the window does not move Up and Down as commanded
Refer to Circuit/System Testing - Passenger Power Window Inoperative.
- If the window moves Up and Down as commanded
- If the window does not move Up and Down as commanded
- Command the rear window lockout by pressing the window lockout switch on the S79D Window Switch-Driver.
- Verify the left rear and right rear window does not move while commanding the window UP and DOWN with the S79LR Window Switch-Left Rear and S79RR Window Switch-Right Rear.
- If a rear window moves UP and DOWN as commanded
Refer to Power Door Child Lock Malfunction .
- If the rear windows do not move UP and DOWN
- If a rear window moves UP and DOWN as commanded
- All OK.
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.