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How can I resolve the problems with the key fob not working for my 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How can I resolve the problems with the key fob not working for my 2020 Toyota Highlander?

How can I resolve the problems with the key fob not working for my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to troubleshoot and resolve key fob issues for your 2020 Toyota Highlander with our step-by-step guide.

Affected Component
key fob
Estimated Time
1-2 hours

Symptoms

  • •Key Fob Not Unlocking/Locking Doors
  • •No Response When Pressing Start Button
  • •Intermittent Functionality
  • •Warning Light on Dashboard

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 a coin
  • •CR2032 battery
  • •Visual inspection
  • •Owner’s manual
  • •Backup key fob
  • •OBD-II scanner (optional)
  • •Multimeter
  • •Battery terminal cleaning brush

Additional Information

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

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Resolving Key Fob Issues for a 2020 Toyota Highlander

Step 1: Check the Battery in the Key Fob

  1. Tools Required:

    • Small flathead screwdriver or a coin.
    • CR2032 battery (if replacement is needed).

  2. Instructions:

    • Using the flathead screwdriver or coin, gently pry open the key fob case.
    • Remove the old battery and check for corrosion or damage.
    • Replace it with a new CR2032 battery, ensuring the positive (+) side is facing up.
    • Reassemble the fob and test its functionality.
Step 2: Inspect the Key Fob for Physical Damage

  1. Tools Required:

    • Visual inspection.

  2. Instructions:

    • Examine the key fob for any visible damage, such as cracks or broken buttons.
    • If damaged, consider replacing the key fob, as this may cause connectivity issues.
Step 3: Check for Interference

  1. Tools Required:

    • None.

  2. Instructions:

    • Move away from potential sources of interference, such as radio towers, large metal structures, or other electronic devices.
    • Test the key fob in a different location to see if the issue persists.
Step 4: Reprogram the Key Fob

  1. Tools Required:

    • Owner’s manual (for instructions on reprogramming).
    • Backup key fob (if available).

  2. Instructions:

    • Insert the key into the ignition and turn it to the "ON" position without starting the engine.
    • Turn the key to "OFF" and back to "ON" two times within five seconds.
    • Remove the key from the ignition. The doors should lock and unlock to indicate the vehicle has entered programming mode.
    • Press any button on the key fob. The doors will lock and unlock again to confirm programming.
    • Repeat for any additional key fobs.
    • Turn the ignition back to "OFF" to exit programming mode.
Step 5: Check the Vehicle's Receiver

  1. Tools Required:

    • OBD-II scanner (optional).
    • Multimeter (if necessary).

  2. Instructions:

    • If the key fob doesn’t work after reprogramming, the issue may lie with the vehicle’s keyless entry system.
    • Use an OBD-II scanner to check for any relevant error codes that may indicate receiver issues.
    • If no codes are present, use a multimeter to test the voltage at the receiver module located under the dashboard.
Step 6: Inspect the Vehicle Battery

  1. Tools Required:

    • Multimeter.
    • Battery terminal cleaning brush (if needed).

  2. Instructions:

    • Check the vehicle battery voltage using a multimeter. A healthy battery should read at least 12.6 volts.
    • If the battery is weak, charge or replace it, as a weak battery may affect the keyless entry system.
Repair Instructions
Replacing the Key Fob

  1. Tools Required:

    • New key fob (available from the dealership or authorized retailer).

  2. Instructions:

    • If the key fob is determined to be faulty and cannot be repaired, obtain a new key fob.
    • Follow the reprogramming steps mentioned above to pair the new fob with your Highlander.
Resetting the Keyless Entry System
  1. Instructions:
    • Disconnect the vehicle battery for about 15 minutes to reset the keyless entry system.
    • Reconnect the battery and check if the key fob functionality is restored.
Conclusion

If you have followed all the steps and the key fob still does not work, it is advisable to visit a certified Toyota dealership or an automotive locksmith. They can diagnose and resolve issues related to the vehicle’s keyless entry system that may require specialized equipment or software.