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How do I fix the problem of the dashboard lights flickering in my 2020 Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I fix the problem of the dashboard lights flickering in my 2020 Highlander?

How do I fix the problem of the dashboard lights flickering in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
635 words

Problem Statement

Learn how to diagnose and fix flickering dashboard lights in your 2020 Toyota Highlander with our step-by-step guide.

Affected Component
dashboard lights
Estimated Time
2-4 hours

Symptoms

  • •Dashboard lights intermittently flicker or dim
  • •Battery warning light
  • •Flickering headlights
  • •Issues with other electrical components

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •Flashlight
  • •Multimeter
  • •Basic Tool Kit
  • •Fuse Puller or Pliers
  • •OBD-II Scanner

Additional Information

Affected Component
dashboard lights
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Back to Generation
Problem: Dashboard Lights Flickering in 2020 Toyota Highlander

Symptoms:

  • Dashboard lights intermittently flicker or dim
  • Possible accompanying symptoms: battery warning light, flickering headlights, or issues with other electrical components
  • No unusual noises or smells typically associated with mechanical failures
Repair Instructions

Step 1: Replace Weak Battery

  1. If the battery voltage is low, remove the negative (-) terminal first, followed by the positive (+) terminal.
  2. Replace the old battery with a new one that matches the OEM specifications.
  3. Reconnect the positive (+) terminal first, followed by the negative (-) terminal.
  4. Check the dashboard lights to see if the flickering has stopped.

Step 2: Replace/Repair Alternator

  1. If the alternator is not charging properly:
    • Disconnect the battery as mentioned above.
    • Remove the serpentine belt by loosening the tensioner.
    • Unbolt the alternator from its mounting bracket and disconnect the electrical connectors.
    • Install the new alternator by reversing the steps and reconnecting the battery.
  2. Test the dashboard lights again.

Step 3: Address Wiring Issues

  1. If any damaged wiring is found during the inspection:
    • Cut out the damaged section of wire using wire cutters.
    • Strip the insulation off both ends of the wires.
    • Use butt connectors or solder the wires together and insulate with electrical tape or heat shrink tubing.
  2. Ensure all ground connections are clean and tight. Remove any corrosion and reattach securely.

Step 4: Replace Fuses

  1. If a blown fuse is identified:
    • Remove the blown fuse and replace it with a fuse of the same amperage rating.
    • Check the dashboard lights after the replacement.

Step 5: Reprogram BCM (if necessary)

  1. If error codes related to the BCM are found:
    • Consult a professional technician or dealership to reprogram or replace the BCM if necessary.
Final Checks
  • Once repairs are made, start the vehicle and observe the dashboard lights for any flickering.
  • Run the vehicle for a short duration and monitor the electrical system for any anomalies.
  • If the issue persists despite all repairs, consult a specialized automotive electrician for further diagnostics.

By following these structured steps, you should be able to diagnose and potentially fix the flickering dashboard lights in your 2020 Toyota Highlander. Always prioritize safety and consult a professional if you are uncertain about any procedures.