* Power Window Switch (Main Control Panel): This is the most probable cause. The switch panel controls both front windows. A faulty switch can cause one or both front windows to stop working while leaving the rear windows unaffected because they have their own independent switch assembly.
* Front Window Motor(s): It's possible one or both front window motors have failed. While less likely to affect both simultaneously, it's a possibility.
* Wiring Harness (Front Doors): A break or short in the wiring harness specifically within the driver's side door (most likely, as this door usually houses the master switch) could affect both front windows. This is more likely if the problem has progressively worsened. Door flexing from repeated use can damage the harness over time.
* Power Window Relay (If Applicable): Some vehicles use relays in the power window circuit. A failed relay, particularly one specific to the front windows, could be the culprit, although this is less common than the switch or motor problems.
* Bad Ground Connection: A poor ground connection somewhere in the front door circuit can prevent the windows from working.
Troubleshooting Steps:
1. Check Fuses: Start with the easiest check – examine the fuse box for any blown fuses related to the power windows. However, if the rear windows work, this is less likely the problem.
2. Inspect the Power Window Switch: Carefully examine the switch panel for any signs of damage, loose connections, or burned components. Sometimes, you can visually identify a problem with a switch.
3. Test the Switches Individually: If you have a multimeter, test the continuity of the front window switches. This will require some electrical knowledge.
4. Check the Window Motors: Access the motors (this requires door panel removal) and visually inspect them for any damage or signs of burning. Try manually moving the regulator (if accessible) – binding may indicate a mechanical problem rather than electrical.
5. Inspect the Wiring Harnesses: Carefully check the wiring harnesses inside the front doors, looking for any obvious damage, breaks, or shorts. Pay special attention to the areas where the wiring flexes as the door opens and closes.
If you lack electrical experience, it's best to take your Buick to a qualified mechanic. Diagnosing and repairing electrical problems can be tricky, and improperly diagnosing could lead to further damage.
