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How can I fix the keyless entry system not working in my 2021 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How can I fix the keyless entry system not working in my 2021 Toyota Highlander?

How can I fix the keyless entry system not working in my 2021 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and repair the keyless entry system in your 2021 Toyota Highlander with our step-by-step guide.

Affected Component
keyless entry system
Estimated Time
1-2 hours

Symptoms

  • •Key fob does not unlock or lock the doors.
  • •No response when pressing the key fob buttons.
  • •Warning lights on the dashboard indicating a key fob issue.
  • •The vehicle does not recognize the key fob when inside.

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

  • •Flathead screwdriver
  • •replacement CR2032 battery
  • •Multimeter
  • •Fuse puller or pliers

Additional Information

Affected Component
keyless entry system
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
4 items

Related Faults

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Back to Generation

Certainly! If your keyless entry system is not working in your 2021 Toyota Highlander, follow this detailed guide to diagnose and fix the problem.

Step 1: Check the Key Fob Battery

  • Symptoms: Fob doesn’t respond at all.
  • Tools Required: Flathead screwdriver, replacement CR2032 battery (if needed).
  • Instructions:
    1. Open the key fob using a flathead screwdriver to gently pry it open.
    2. Remove the old battery and check for signs of corrosion or damage.
    3. Replace with a new CR2032 battery, ensuring the positive side is facing up.
    4. Reassemble the key fob and test if it works.

Step 2: Inspect for Physical Damage

  • Symptoms: Fob not responding intermittently.
  • Instructions:
    1. Visually inspect the key fob for cracks, moisture, or damage.
    2. If any issues are found, consider replacing the key fob.

Step 3: Check for Interference

  • Symptoms: Key fob works intermittently or only at close range.
  • Instructions:
    1. Move away from potential signal interference sources such as radio towers, mobile phones, or other electronic devices.
    2. Test the key fob again to see if it functions properly.

Step 4: Verify Vehicle Settings

  • Symptoms: Key fob is functional but doors do not respond.
  • Instructions:
    1. Inside the vehicle, turn the ignition on (do not start).
    2. Access the vehicle settings on the infotainment system.
    3. Navigate to the "Door Lock" settings and ensure "Keyless Entry" is enabled.

Step 5: Check the Vehicle's Battery

  • Symptoms: Vehicle electronics malfunctioning, including keyless entry.
  • Tools Required: Multimeter.
  • Instructions:
    1. Use a multimeter to check the vehicle's battery voltage (should be around 12.6 volts).
    2. If the voltage is below 12.4 volts, consider charging the battery or replacing it.

Step 6: Inspect Keyless Entry System Fuse

  • Symptoms: No response from the keyless entry system.
  • Tools Required: Fuse puller or pliers, multimeter.
  • Instructions:
    1. Locate the fuse box (usually under the dashboard on the driver's side or in the engine compartment).
    2. Identify the fuse related to the keyless entry system (refer to the owner's manual).
    3. Remove the fuse and check for continuity using a multimeter.
    4. If the fuse is blown, replace it with a fuse of the same amperage.
Repair Instructions

If the diagnostics indicate a faulty key fob or other issues, follow these steps to make the necessary repairs.

Step 1: Replace Key Fob

  • Instructions:
    1. Purchase a new key fob from a Toyota dealer or a certified locksmith.
    2. Program the new key fob:
      • Insert the original key into the ignition and turn it to "ON" without starting the engine.
      • Remove the key and insert the new key fob into the ignition.
      • Turn it to "ON" and press the lock button on the new key fob.
      • The vehicle should respond with a beep confirming programming.

Step 2: Replace Fuse

  • Instructions:
    1. If a blown fuse was identified, replace it with one of the same amperage.
    2. Reassemble the fuse box cover and test the keyless entry system.
Conclusion

After following these diagnostic and repair steps, your keyless entry system should be functioning correctly. If the issue persists, it may be necessary to consult a professional technician for further diagnosis, as the problem could be related to the vehicle's central locking system or BCM (Body Control Module). Always refer to the vehicle's service manual for specific technical specifications and procedures.