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How can I fix the malfunctioning turn signals in my 2020 Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How can I fix the malfunctioning turn signals in my 2020 Highlander?

How can I fix the malfunctioning turn signals in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and fix malfunctioning turn signals in your 2020 Toyota Highlander with detailed steps and required tools.

Affected Component
turn signals
Estimated Time
2 hours

Symptoms

  • •Turn signals do not illuminate
  • •Hyper-flashing
  • •Indicator light on dashboard
  • •Flickering lights

Diagnostic Steps

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

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

  • •Flathead screwdriver
  • •Phillips screwdriver
  • •Multimeter
  • •Replacement bulbs (for turn signals)
  • •Replacement fuses (if necessary)
  • •Relay tester (or a similar relay for swapping)
  • •Wire connectors and electrical tape (if wiring repairs are needed)

Additional Information

Affected Component
turn signals
Estimated Time
2 hours
Difficulty
medium
Severity
medium
Tools Required
7 items

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Fixing Malfunctioning Turn Signals in a 2020 Toyota Highlander

Tools Required
  1. Flathead screwdriver
  2. Phillips screwdriver
  3. Multimeter
  4. Replacement bulbs (for turn signals)
  5. Replacement fuses (if necessary)
  6. Relay tester (or a similar relay for swapping)
  7. Wire connectors and electrical tape (if wiring repairs are needed)
Repair Instructions
Step 1: Replace Faulty Bulbs
  1. Remove Bulbs: Open the trunk or hood depending on whether you are accessing rear or front signals.
    • For front signals, remove the headlight assembly as per the owner's manual.
    • For rear signals, open the tailgate and access the signal assembly.
  2. Install New Bulbs: Replace any burned-out bulbs with new ones. Ensure they are secured in their sockets.
Step 2: Replace Fuses
  1. Locate Fuse Box: Open the driver’s side door and remove the panel covering the fuse box.
  2. Identify and Replace Fuse: Refer to the fuse diagram on the panel cover or in the owner's manual. Pull the fuse associated with the turn signals using a fuse puller or needle-nose pliers. Replace it with a new fuse of the same amperage.
Step 3: Replace Turn Signal Relay
  1. Locate Relay: Find the turn signal relay in the fuse box (refer to the owner's manual for specific location).
  2. Swap or Test: Remove the relay and test it using a relay tester, or swap it with another relay of the same type to see if the turn signals function correctly.
Step 4: Repair Wiring (if necessary)
  1. Inspect Wiring: Look for any damaged wires or connectors leading to the turn signals.
  2. Repair or Replace Wiring: If any wiring is damaged, cut and strip the wire ends and use wire connectors to repair. Wrap with electrical tape to insulate.
Step 5: Test the System
  1. Turn on the Ignition: Start the vehicle or turn on the ignition.
  2. Test Turn Signals: Activate the left and right turn signals separately and observe if the lights function correctly.
  3. Check Dashboard Indicators: Ensure that the dashboard indicators correspond to the activated signals.
Conclusion

By following these detailed steps, you should be able to diagnose and fix the malfunctioning turn signals on your 2020 Toyota Highlander. If, after these repairs, the turn signals still fail to function correctly, consider consulting with a certified Toyota technician for further diagnostics, as there may be deeper electrical system issues involved.