* The new circuit breaker is faulty: While unlikely, it's possible the replacement breaker is defective. Try testing it with a multimeter to ensure it's functioning correctly.
* Wiring issues: The problem might lie in the wiring itself. Look for broken, frayed, or corroded wires running from the breaker to the window switches and motors. This is common in older cars, especially in areas subject to flexing (like the door jambs). Check the connectors for corrosion too.
* Window switch problems: The master switch or individual window switches could be faulty. Try all switches. If one switch controls multiple windows, it is more likely to be the problem than if each window has its own switch.
* Window motor problems: The motor for one or more windows could have burnt out, seized up, or have internal problems. This is often accompanied by a clicking sound when trying to operate the window.
* Window regulator problems: The window regulator (the mechanism that moves the window) could be broken or jammed. This is common if the window was forced or if it's been binding.
* Fuse problems (separate from the breaker): While you've checked the breaker, there might be a separate fuse related to the power windows. Consult your owner's manual to locate the appropriate fuse(s).
* Grounding issues: A poor ground connection can prevent the circuit from completing. Check the ground points for corrosion or loose connections.
* Body control module (BCM) problem: The BCM controls various electrical functions in the car, and a malfunctioning BCM could prevent the power windows from working. This is less likely, but possible. Diagnosis would require specialized tools.
Troubleshooting Steps:
1. Test the new circuit breaker: Use a multimeter to confirm it's working correctly.
2. Check fuses: Locate the relevant fuse(s) in the fuse box (under the hood or inside the car, usually described in the owner's manual).
3. Inspect wiring: Carefully examine all wiring related to the power windows, paying close attention to areas that flex or are exposed to the elements.
4. Test the switches: Try each switch individually. If one switch controls multiple windows, it's often the culprit.
5. Listen for clicking noises: When attempting to operate the windows, listen for clicking sounds indicating a problem with the motor or regulator.
6. Check for loose or corroded ground connections.
If you're not comfortable working with car electrical systems, it's best to take your Malibu to a qualified mechanic for diagnosis and repair. Incorrect repairs can lead to further damage or even safety hazards.
