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

What are the common problems with the keyless entry system in the 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
5 min read
833 words

Problem Statement

Explore common issues with the keyless entry system in the 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component
Keyless Entry System

Symptoms

  • •Key fob not responding
  • •Range of key fob significantly reduced
  • •Dashboard warning light for the keyless entry system
  • •Key fob works intermittently or not at all after a battery replacement
  • •Vehicle does not recognize the key fob
  • •Key fob works inconsistently especially near other electronic devices
  • •Can’t unlock doors when parked near certain locations
  • •The key fob works sporadically regardless of battery condition
  • •Difficulty unlocking the car from a normal distance
  • •Doors do not lock/unlock consistently
  • •Key fob functions but does not engage the door locks

Diagnostic Steps

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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
  • •Replacement battery (typically CR2032)
  • •OBD-II scanner (optional if programming is necessary)
  • •Access to the vehicle’s manual
  • •Multimeter
  • •Screwdrivers (for panel removal)
  • •Basic hand tools

Additional Information

Affected Component
Keyless Entry System
Difficulty
medium
Severity
medium
Tools Required
7 items

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Common Problems with the Keyless Entry System in the 2020 Toyota Highlander

The keyless entry system in the 2020 Toyota Highlander is generally reliable, but like any electronic system, it can experience issues. Below are some common problems, along with symptoms, diagnostic steps, tools required, and repair instructions.

Common Problems
  1. Key Fob Battery Failure
  2. Key Fob Programming Issues
  3. Interference from Other Electronic Devices
  4. Faulty Keyless Entry Antenna
  5. Malfunctioning Central Locking System
Problem 1: Key Fob Battery Failure
Tools Required
  • Small flathead screwdriver
  • Replacement battery (typically CR2032)

Repair Instructions

  1. Open the Key Fob:

    • Use a small flathead screwdriver to gently pry apart the key fob casing.

  2. Replace the Battery:

    • Remove the old battery and insert the new one, ensuring the positive side is facing up.

  3. Reassemble the Key Fob:

    • Snap the halves of the fob back together and test its functionality.
Problem 2: Key Fob Programming Issues
Tools Required
  • OBD-II scanner (optional if programming is necessary)
  • Access to the vehicle’s manual

Repair Instructions

  1. Reprogram the Key Fob:

    • Insert the key into the ignition and turn to the "ON" position without starting the engine.
    • Press and hold the "Lock" button on the key fob for 1-2 seconds, then release.
    • Turn the ignition to "OFF" and then back to "ON" within 5 seconds.
    • Repeat the process for additional fobs if necessary.

  2. Use OBD-II Scanner (if applicable):

    • Connect the OBD-II scanner to the vehicle’s diagnostic port.
    • Follow the programming instructions specific to the scanner.
Problem 3: Interference from Other Electronic Devices
Tools Required
  • None specifically required.

Repair Instructions

  1. Identify Interference Source:

    • Move away from known electronic devices and test the key fob.

  2. Mitigate Interference:

    • If the source is identified, consider relocating it or using a key fob signal-blocking pouch.
Problem 4: Faulty Keyless Entry Antenna
Tools Required
  • Multimeter
  • Screwdrivers (for panel removal)

Repair Instructions

  1. Access the Antenna:

    • Remove any necessary panels or covers to access the keyless entry antenna, typically located near the rearview mirror or under the dashboard.

  2. Inspect and Test:

    • Check for any damage or loose connections in the antenna wiring.
    • Use the multimeter to test for continuity.

  3. Replace Antenna (if required):

    • Disconnect the faulty antenna and replace it with a new unit. Reassemble the panels.
Problem 5: Malfunctioning Central Locking System
Tools Required
  • Multimeter
  • Basic hand tools

Repair Instructions

  1. Inspect the Door Lock Actuators:

    • Remove the door panel to access the locking mechanism.
    • Test the actuators with a multimeter to check for power when the key fob is used.

  2. Replace Actuator (if necessary):

    • If the actuator is faulty, disconnect it and replace it with a new one.
    • Reassemble the door panel and test the operation.
Conclusion

The keyless entry system in the 2020 Toyota Highlander can be diagnosed and repaired by following these structured steps. Common issues primarily involve the key fob, programming, interference, the antenna, and the central locking system. Always refer to the vehicle’s service manual for specific instructions and specifications related to your model. If problems persist, consider seeking professional assistance.