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How can I fix the key fob not working on my 2020 Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How can I fix the key fob not working on my 2020 Highlander?

How can I fix the key fob not working on my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
590 words

Problem Statement

Learn how to diagnose and fix key fob issues on your 2020 Toyota Highlander with detailed steps and tools required.

Affected Component
key fob
Estimated Time
1-2 hours

Symptoms

  • •Key fob does not unlock/lock doors.
  • •Key fob does not start the vehicle.
  • •The key fob light does not illuminate when buttons are pressed.
  • •Error message on dashboard indicating key fob issue.

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

  • •Small flathead screwdriver or coin
  • •Replacement battery (CR2032 or similar)
  • •Your working key fob
  • •Another key fob (if available)
  • •Small screwdriver set
  • •Multimeter (optional)
  • •OBD-II scanner (optional)

Additional Information

Affected Component
key fob
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
7 items

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Fixing Key Fob Not Working on 2020 Toyota Highlander

If your key fob is not working for your 2020 Toyota Highlander, follow these detailed steps to diagnose and fix the issue.

Step 1: Check the Battery
  1. Symptom Check: If the fob is unresponsive, it may be due to a dead battery.
  2. Tools Required:
    • Small flathead screwdriver or coin
    • Replacement battery (CR2032 or similar, check your manual)
  3. Instructions:
    • Gently pry open the key fob using the flathead screwdriver or coin.
    • Remove the battery and inspect it for corrosion or damage.
    • Replace with a new battery, ensuring the positive (+) side is facing the correct direction (as indicated inside the fob).
    • Reassemble the fob and test.
Step 2: Check for Interference
  1. Symptom Check: If the fob is not working intermittently.
  2. Instructions:
    • Move away from electronic devices or other vehicles that may cause interference.
    • Try using the fob again from different distances or angles.
Step 3: Reprogram the Key Fob
  1. Symptom Check: If the fob works intermittently or has stopped working after a battery change.
  2. Tools Required:
    • Your working key fob
    • Another key fob (if available) for paired testing
  3. Instructions:
    • Sit inside the vehicle with all doors closed.
    • Insert the key into the ignition and turn it to the "ON" position (do not start the engine).
    • Turn the key back to the "OFF" position and remove it.
    • Repeat this process (ON-OFF) five times within 10 seconds. The doors will lock and unlock automatically if successful.
    • Press the "LOCK" button on the key fob to finalize the programming.
    • Test the fob.
Step 4: Inspect the Key Fob Circuit Board
  1. Symptom Check: If the fob still does not work after replacing the battery and reprogramming.
  2. Tools Required:
    • Small screwdriver set
    • Multimeter (optional)
  3. Instructions:
    • Open the key fob again.
    • Inspect the circuit board for signs of damage, such as cracks or burnt components.
    • Use the multimeter to check continuity of the buttons on the board.
    • If damage is found, consider replacing the fob or repairing it with a soldering kit if you have experience.
Step 5: Check Vehicle Keyless Entry System
  1. Symptom Check: If both key fobs are non-functional.
  2. Tools Required:
    • OBD-II scanner (optional)
  3. Instructions:
    • Check the vehicle’s fuse box for any blown fuses related to the keyless entry system.
    • Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the keyless entry or immobilizer system.
    • If DTCs are present, refer to the service manual for troubleshooting specific codes.
Step 6: Visit a Professional
  1. Symptom Check: If all previous steps fail.
  2. Instructions:
    • Take the vehicle to a certified Toyota dealership or a qualified automotive locksmith.
    • They can perform more advanced diagnostics and reprogramming, as well as replace the key fob if necessary.
Conclusion

By following these steps, you can diagnose and fix the key fob issues on your 2020 Toyota Highlander. Always refer to the owner’s manual for specific details regarding your vehicle’s key fob system. If you are uncomfortable with any of the steps, consult a professional technician.