my GMC Sierra power windows won't work what's wrong

Learn how to diagnose and fix power window issues in GMC Sierra. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the vehicle battery to prevent electrical shock.

2. Replace the Fuse

• Locate the fuse box, typically found under the dashboard or in the engine compartment.
• Remove the power window fuse using a fuse puller.
• Inspect the fuse for continuity; replace it with a new fuse of the same amperage if blown.

3. Inspect and Replace the Power Window Switch

• Remove the door panel using a socket set and trim removal tools.
• Disconnect the wiring harness from the power window switch.
• Test the switch with a multimeter; replace it if it does not show continuity when pressed.
• Reinstall the new switch and reconnect the wiring harness.

4. Replace the Window Motor or Regulator

• If the window motor is faulty, remove the bolts securing it to the door frame.
• Disconnect the motor's wiring harness and remove the motor.
• Install the new motor in reverse order, ensuring all connections are secure.
• If the regulator is damaged, repeat the process to replace it, ensuring it operates smoothly before reassembly.

5. Reassemble the Door Panel

• Reattach the door panel by aligning it with the clips and screws.
• Ensure that all electrical connections are secure and that the panel is properly seated.
• Reconnect the vehicle battery.