why does my Volkswagen Passat B8 (2015-2022) dashboard lights flicker?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Ensure the vehicle is on a flat surface and securely supported if lifting is required.

2. Inspect Battery and Connections

• Sub-steps:
  • Remove the battery cover if applicable.
  • Clean any corrosion from battery terminals using a mixture of baking soda and water.
  • Tighten the battery terminals to ensure a good connection.
  • Reconnect the negative terminal.
• Tools Required: Battery terminal cleaner, wrench.

3. Test Alternator Output

• Sub-steps:
  • Reconnect the battery and start the engine.
  • Use a multimeter to measure the voltage across the battery terminals; it should read between 13.7 to 14.7 volts at idle.
  • Increase the engine RPM to around 2000 and check the voltage again; it should remain within the same range.
• Tools Required: Multimeter.

4. Check Fuses

• Sub-steps:
  • Locate the fuse box, typically found under the dashboard or in the engine compartment.
  • Inspect the fuses related to the dashboard and lighting systems. Replace any blown fuses with the correct amperage rating.
• Tools Required: Fuse puller or pliers.

5. Inspect Wiring and Ground Connections

• Sub-steps:
  • Visually inspect wiring harnesses for damage; repair or replace damaged wires as necessary.
  • Check ground connections for tightness and corrosion; clean or tighten as needed.
• Tools Required: Wire brush, multimeter.