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What should I do if my 2020 Toyota Highlander’s dashboard lights are flickering? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What should I do if my 2020 Toyota Highlander’s dashboard lights are flickering?

What should I do if my 2020 Toyota Highlander’s dashboard lights are flickering?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
608 words

Problem Statement

Learn how to diagnose and fix flickering dashboard lights on your 2020 Toyota Highlander with these step-by-step instructions.

Affected Component
Electrical system
Estimated Time
1-2 hours

Symptoms

  • •Dashboard lights flicker intermittently or constantly
  • •Other electrical components may also act erratically (e.g., headlights dimming, radio cutting out)
  • •Warning lights may illuminate on the dashboard (e.g., battery warning light)
  • •The vehicle may experience difficulty starting or exhibit poor performance

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

  • •Multimeter
  • •Battery terminal cleaner/brush
  • •Safety gloves and goggles
  • •Socket set
  • •Wire brush

Additional Information

Affected Component
Electrical system
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Back to Generation

If the dashboard lights on your 2020 Toyota Highlander are flickering, it could indicate various issues, ranging from electrical problems to battery or alternator issues. Follow the steps below to diagnose and potentially resolve the issue.

Step 1: Visual Inspection

  1. Check for Loose Connections
    • Examine the dashboard for any loose or damaged wiring.
    • Inspect the fuse box for any blown fuses related to the dashboard and illumination circuits.

Step 2: Battery Condition Check

  1. Tools Required:

    • Multimeter
    • Battery terminal cleaner/brush
    • Safety gloves and goggles

  2. Check Battery Voltage

    • Turn off all electrical components and the engine.
    • Using a multimeter, measure the battery voltage. A healthy battery should show around 12.6 volts or higher.
    • If the voltage is below 12.4 volts, the battery may be weak or discharged.

  3. Inspect Battery Terminals

    • Ensure that the battery terminals are clean and tightly connected. Corrosion can cause poor electrical connections.
    • Clean any corrosion using a battery terminal cleaner or a mixture of baking soda and water.

Step 3: Alternator Check

  1. Tools Required:

    • Multimeter
    • Socket set

  2. Check Alternator Output

    • Start the engine and use the multimeter to measure the voltage across the battery terminals again.
    • The reading should be between 13.7 to 14.7 volts if the alternator is functioning properly.
    • If the voltage is lower than this while the engine is running, the alternator may be failing.

  3. Inspect Alternator Connections

    • Check the alternator wiring and connections for any signs of wear or damage.
    • Ensure that the alternator belt is in good condition and properly tensioned.

Step 4: Check Ground Connections

  1. Tools Required:

    • Socket set
    • Wire brush

  2. Inspect Ground Points

    • Locate ground points under the hood, particularly near the battery and engine block.
    • Ensure that ground connections are clean and secure.
    • If corrosion or dirt is present, clean the connections using a wire brush and re-tighten.
Repair Instructions

If the Battery is Weak

  1. Jump Start or Replace the Battery
    • If the battery voltage is low, jump-start the vehicle or replace the battery if necessary.
    • Ensure to properly dispose of the old battery.

If the Alternator is Faulty

  1. Replace the Alternator
    • Disconnect the battery terminals (negative first).
    • Remove the serpentine belt from the alternator pulley.
    • Disconnect the electrical connectors and remove the mounting bolts for the alternator.
    • Install the new alternator, reconnect the electrical connectors, and reattach the serpentine belt.
    • Reconnect the battery terminals.

If Ground Connections are the Issue

  1. Clean and Secure Ground Connections
    • Disconnect the ground cable and clean the connection point on the frame.
    • Reattach the ground cable securely and ensure all ground points are clean.
Final Steps
  • After performing repairs, start the vehicle and observe the dashboard lights.
  • Monitor for any flickering or unusual behavior.
  • If the issue persists after these checks, consider seeking professional assistance as it may involve more complex electrical issues.
Conclusion

By following these diagnostic steps, you should be able to identify and remedy the flickering dashboard lights on your 2020 Toyota Highlander. Always exercise caution when working with electrical systems and consult your vehicle’s service manual for specific details related to your model.