why does my Toyota Highlander XU70 (2020-Present) dashboard lights keep flickering

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, screwdrivers, wire brush, and safety gloves.
• Disconnect the negative battery terminal to prevent electrical shock while working on the vehicle.

2. Battery and Connections Inspection

• Sub-steps:
  • Remove the battery cover if equipped and check for corrosion on terminals.
  • Clean any corrosion using a wire brush and reconnect the terminals tightly.
  • Reconnect the negative battery terminal.

3. Alternator Testing

• Sub-steps:
  • Start the engine and let it idle.
  • Use a multimeter to measure the voltage across the battery terminals.
  • If the voltage is below 13.5 volts, replace the alternator.

4. Fuse Inspection

• Sub-steps:
  • Locate the fuse box and identify the fuses related to the dashboard lighting.
  • Remove each fuse and check for continuity using the multimeter.
  • Replace any blown fuses with the correct amperage.

5. Wiring and Dimmer Switch Check

• Sub-steps:
  • Visually inspect the wiring harness for any frays or loose connections.
  • If damaged wires are found, repair or replace them as necessary.
  • Test the dimmer switch by adjusting it through its range; replace it if it does not function correctly.