how to fix my Volkswagen Passat B8 (2015-2022) door locks not working?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, screwdrivers, socket set.
• Disconnect the vehicle battery to prevent electrical shock or short circuits.
• Allow the vehicle to cool down before working on electrical components.

2. Inspect and Replace Key Fob Battery

• Remove the key fob casing using a small flathead screwdriver.
• Take out the old battery and replace it with a new CR2032 battery.
• Reassemble the key fob and test its functionality.

3. Repair Wiring Connections

• Remove the door panel using a socket set and screwdriver.
• Carefully inspect the wiring harness inside the door for frayed wires or loose connections.
• Repair any damaged wires using solder or appropriate wire connectors.
• Reassemble the door panel securely.

4. Test and Replace Door Lock Actuators (if necessary)

• Use a multimeter to check if the door lock actuators receive power when the lock/unlock buttons are pressed.
• If actuators are not functioning, remove them from the door by unscrewing mounting screws and disconnecting the wiring.
• Install new door lock actuators, ensuring proper alignment and secure connections.

5. Verify Central Locking Relay

• Locate the central locking relay in the fuse box.
• Remove the relay and inspect for any visible damage.
• Replace with a new relay if necessary, ensuring it matches the specifications.