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What common problems occur with the 2020 Toyota Highlander’s keyless entry system? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What common problems occur with the 2020 Toyota Highlander’s keyless entry system?

What common problems occur with the 2020 Toyota Highlander’s keyless entry system?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Explore common issues, symptoms, and diagnostic steps for the keyless entry system in the 2020 Toyota Highlander.

Affected Component
keyless entry system
Estimated Time
1-2 hours

Symptoms

  • •Key Fob Not Responding
  • •Intermittent Functionality
  • •Error Messages on Dashboard
  • •Range Issues
  • •Battery Drain

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

  • •Multimeter
  • •OBD-II Scanner
  • •Key Fob Battery Replacement Kit
  • •Screwdriver Set
  • •Wiring Diagram

Additional Information

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

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Common Problems with the 2020 Toyota Highlander’s Keyless Entry System

The 2020 Toyota Highlander, like many modern vehicles, incorporates a keyless entry system that can experience various issues. Below are common problems, symptoms, diagnostic steps, and potential solutions.

Common Symptoms

  1. Key Fob Not Responding

    • Symptoms: The vehicle does not unlock or lock with the key fob, or the engine does not start.

  2. Intermittent Functionality

    • Symptoms: The keyless entry works sporadically, sometimes responding and other times not.

  3. Error Messages on Dashboard

    • Symptoms: Messages such as "Key Not Detected" appear on the dashboard.

  4. Range Issues

    • Symptoms: The key fob works only when very close to the vehicle.

  5. Battery Drain

    • Symptoms: The vehicle’s battery drains faster than expected.
Tools Required
  • Multimeter: To check battery voltage.
  • OBD-II Scanner: To retrieve any error codes from the vehicle's computer.
  • Key Fob Battery Replacement Kit: For changing the key fob battery.
  • Screwdriver Set: For disassembly if necessary.
  • Wiring Diagram: For tracing any electrical issues.
Step-by-Step Diagnostic Process

  1. Check Key Fob Battery

    • Action: Open the key fob and replace the battery.
    • Diagnostic Check: Use a multimeter to ensure the new battery is functioning correctly (typically 3V for CR2032).

  2. Test Key Fob Range

    • Action: Stand several feet away from the vehicle and press the lock/unlock button.
    • Diagnostic Check: If it works only at close range, the fob may need reprogramming or replacement.

  3. Inspect for Physical Damage

    • Action: Examine the key fob for cracks or damage.
    • Diagnostic Check: If damaged, consider replacing the fob.

  4. Scan for Error Codes

    • Action: Connect an OBD-II scanner to the vehicle's diagnostic port.
    • Diagnostic Check: Look for any stored codes related to the keyless entry system.

  5. Check Vehicle's Keyless Entry System

    • Action: Inspect the vehicle’s keyless entry receiver and wiring.
    • Diagnostic Check: Refer to wiring diagrams to ensure all connections are secure and undamaged.

  6. Perform a System Reset

    • Action: Disconnect the vehicle battery for about 10 minutes to reset the electronics.
    • Diagnostic Check: Reconnect and check if the issue persists.
Repair Instructions
1. Key Fob Battery Replacement
  • Instructions:
    1. Use a small screwdriver to open the key fob.
    2. Remove the old battery and replace it with a new one (ensure proper polarity).
    3. Reassemble the fob and test its functionality.
2. Reprogramming Key Fob
  • Instructions:
    1. Enter the vehicle and close all doors.
    2. Insert the key into the ignition and turn to the "ON" position without starting the engine.
    3. Press the "Unlock" button on the fob and release it.
    4. Turn the ignition off and then back to "ON" again.
    5. Repeat the process two times, and on the third time, leave it in the "ON" position.
    6. Press the "Lock" button on the fob. This should reprogram it.
3. Replacing the Keyless Entry Receiver
  • Instructions:
    1. Disconnect the vehicle battery.
    2. Locate the keyless entry receiver (usually beneath the dashboard or in the trunk area).
    3. Remove any screws or clips securing it and disconnect the wiring harness.
    4. Install the new receiver by reversing the steps.
    5. Reconnect the battery and test the keyless entry system.
4. Addressing Wiring Issues
  • Instructions:
    1. Use a wiring diagram to locate the keyless entry wiring harness.
    2. Inspect for any frayed wires, corrosion, or loose connections.
    3. Repair or replace any damaged wiring as necessary.
Conclusion

By following the outlined symptoms, diagnostic steps, and repair instructions, you should be able to address common issues with the 2020 Toyota Highlander's keyless entry system. If problems persist after performing these diagnostics and repairs, it may be advisable to consult with a certified Toyota technician for further examination.