my Volkswagen Passat B8 (2015-2022) headlights keep flickering during driving what's wrong

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle battery to ensure safety during inspection and repairs.
• Tools required:
  • OBD-II scanner
  • Multimeter
  • Socket set
  • Torque wrench
  • Screwdrivers

2. Inspect and Replace Headlight Bulbs

• Remove the headlight assembly as follows:
  1. Unscrew the retaining screws on the headlight assembly.
  2. Carefully pull the assembly out from the vehicle.
• Replace the headlight bulb:
  1. Disconnect the wiring harness from the back of the bulb.
  2. Remove the old bulb by twisting it counterclockwise.
  3. Install the new bulb by aligning it and twisting it clockwise until secure.
  4. Reconnect the wiring harness.
• Reinstall the headlight assembly:
  1. Align the assembly with the mounting points and secure it with screws.
  2. Torque the screws to the manufacturer's specifications.

3. Check and Repair Wiring Harness

• Inspect the wiring harness:
  1. Look for any visible signs of wear, fraying, or corrosion.
  2. Use a multimeter to check continuity of the wires.
• Repair any damaged wiring:
  1. Cut out damaged sections and splice in new wire using solder or connectors.
  2. Insulate repaired sections with heat shrink tubing or electrical tape.

4. Test Battery and Alternator

• Check the battery:
  1. Measure the voltage across the battery terminals using a multimeter (should be around 12.6 volts when fully charged).
  2. If the voltage is low, consider replacing the battery.
• Test the alternator:
  1. Start the vehicle and measure voltage at the battery again (should be between 13.8 to 14.4 volts).
  2. If the voltage is out of this range, replace the alternator.