how to troubleshoot power windows not working on Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, flathead screwdriver, and a Phillips screwdriver.
• Disconnect the vehicle's battery to avoid electrical shock.

2. Inspect and Replace Fuses

• Locate the fuse box, usually found under the dashboard or in the engine compartment.
• Identify the fuse for the power windows (refer to the owner's manual for the specific fuse location).
• Remove the fuse using a fuse puller and inspect it for continuity. Replace it if it is blown.
• Reconnect the battery and test the power windows.

3. Check Window Switch

• Remove the door panel using a flathead screwdriver and Phillips screwdriver.
• Disconnect the window switch from its connector.
• Use a multimeter set to continuity mode to check the switch. If there is no continuity when pressed, replace the switch.
• Reinstall the switch and door panel once confirmed functional.

4. Inspect Wiring and Connectors

• With the door panel removed, visually inspect the wiring harness for any signs of wear, fraying, or corrosion.
• Ensure that all connectors are firmly seated; reseat any loose connections.
• If damage is found, repair or replace the wiring as necessary.

5. Test the Window Motor

• Disconnect the window motor connector.
• Using a multimeter, check for voltage at the motor connector while activating the window switch.
• If voltage is present but the motor does not operate, replace the window motor.
• If no voltage is detected, further investigate the wiring and BCM for issues.