why does my Volkswagen Passat B8 (2015-2022) headlights flicker while driving

Solution

1. Preparation

• Gather tools: multimeter, socket set, screwdriver set, and replacement fuses.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect Headlight Bulbs

• Remove the headlight assembly as needed using the socket set.
• Check each bulb for signs of damage (burned out filaments, dark spots).
• Replace any defective bulbs with OEM or high-quality aftermarket parts.

3. Check Battery and Alternator

• Reconnect the battery and use the multimeter to measure the voltage across the battery terminals.
  • A healthy battery should read around 12.6 volts (engine off) and between 13.7-14.7 volts (engine running).
• If the voltage is below these ranges, consider replacing the battery or testing the alternator for proper function.

4. Inspect Wiring and Connections

• Visually inspect the wiring harness connected to the headlights for any damage or loose connectors.
• Tighten any loose connections and repair or replace damaged wiring.

5. Replace Blown Fuses

• Check the fuse box for any blown fuses related to the headlight circuit.
• Replace blown fuses with the correct amperage rating (consult owner’s manual for specifications).

6. Final Assembly and Testing

• Reassemble any components that were removed for inspection.
• Reconnect the negative battery terminal.
• Start the vehicle and test the headlights to ensure they operate without flickering.