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How do I address a faulty key fob for my 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I address a faulty key fob for my 2020 Toyota Highlander?

How do I address a faulty key fob for my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1 hour
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
641 words

Problem Statement

Learn how to diagnose and fix issues with the key fob of your 2020 Toyota Highlander, including battery replacement and reprogramming steps.

Affected Component
key fob
Estimated Time
1 hour

Symptoms

  • •Inability to lock/unlock doors remotely
  • •Key fob not starting the engine
  • •Weak or intermittent signal
  • •Battery warning light illuminated on the dashboard
  • •Physical damage to the key fob

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 or a coin
  • •New battery (CR2032)
  • •OBD-II scanner (optional for deeper diagnostics)

Additional Information

Affected Component
key fob
Estimated Time
1 hour
Difficulty
medium
Severity
medium
Tools Required
3 items

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Addressing a Faulty Key Fob for a 2020 Toyota Highlander

If you are experiencing issues with the key fob for your 2020 Toyota Highlander, follow the steps below to diagnose and potentially resolve the problem.

Tools Required
  • Flathead screwdriver or a coin
  • New battery (CR2032)
  • OBD-II scanner (optional for deeper diagnostics)

Repair Instructions

Step 1: Replace the Key Fob Battery

  1. Open the Key Fob:

    • Insert a flathead screwdriver or a coin into the slot on the side of the key fob.
    • Gently twist to separate the two halves of the fob.

  2. Replace the Battery:

    • Remove the old battery and note the orientation (positive side).
    • Insert the new battery in the same orientation.

  3. Reassemble the Key Fob:

    • Align the two halves and press them together until they click back into place.
Step 2: Reprogram the Key Fob

  1. Enter Programming Mode:

    • Sit inside your Highlander and close all doors.
    • Insert the key into the ignition and turn it to the "ON" position (do not start the engine).
    • Turn the key back to "OFF" and remove it from the ignition.

  2. Key Fob Programming Steps:

    • Insert the key back into the ignition and turn to "ON" again, then back to "OFF".
    • Repeat this step 5 times (the fifth time, leave it in "ON").
    • You should hear a locking sound indicating the car is in programming mode.

  3. Program the Key Fob:

    • Press any button on the key fob once.
    • You should hear a lock/unlock sound indicating successful programming.
    • If you have multiple key fobs, repeat this step for each one.

  4. Exit Programming Mode:

    • Turn the ignition back to "OFF" to exit programming mode.
    • Test the key fob functions to ensure they are working.
Step 3: OBD-II Scan (if necessary)

  1. Connect the OBD-II Scanner:

    • Locate the OBD-II port under the dashboard near the driver's side.
    • Plug in the OBD-II scanner and turn the ignition to "ON" (do not start).

  2. Scan for Codes:

    • Follow the scanner's instructions to read any fault codes related to the key fob or vehicle security system.
    • Document any codes and investigate them further as necessary.

Conclusion

By following these steps, you should be able to diagnose and address the issues with your key fob for the 2020 Toyota Highlander. If problems persist after battery replacement and reprogramming, it may be necessary to consult a professional technician for further assistance or consider replacing the key fob.