my Volkswagen Golf MK7 (2015-2019) headlights flicker when I turn them on

Solution

1. Preparation

• Gather tools and parts.
• Tools Required:
  • Multimeter
  • Socket set
  • Screwdriver set
  • OBD-II scanner
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Inspect Battery and Connections

• Sub-steps:
  1. Disconnect the negative terminal of the battery.
  2. Clean any corrosion on the battery terminals using a wire brush.
  3. Tighten any loose connections.
  4. Reconnect the battery and test the voltage again.

3. Check Alternator Function

• Sub-steps:
  1. Start the engine and connect the multimeter to the battery terminals.
  2. Measure the voltage output. If it is below 13.5 volts, the alternator may need replacement.
  3. If necessary, remove the alternator following the vehicle's service manual for specific removal instructions.

4. Inspect Headlight Wiring

• Sub-steps:
  1. Remove the headlight assembly as per the service manual.
  2. Visually inspect the wiring harness for any signs of wear, corrosion, or loose connections.
  3. Repair or replace any damaged wiring or connectors.

5. Replace Headlight Bulbs (if necessary)

• Sub-steps:
  1. If bulbs are found faulty, remove the old bulbs by twisting them counter-clockwise.
  2. Insert new bulbs, ensuring they are securely seated.
  3. Reassemble the headlight assembly and reconnect it.