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How can I fix the issues with the keyless entry system in my 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How can I fix the issues with the keyless entry system in my 2020 Toyota Highlander?

How can I fix the issues with the keyless entry system in my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and repair keyless entry system issues in your 2020 Toyota Highlander with step-by-step instructions and required tools.

Affected Component
keyless entry system
Estimated Time
2-4 hours

Symptoms

  • •Key Fob Not Responding
  • •Intermittent Operation
  • •No Response from Vehicle
  • •Dashboard Warning Light

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

  • •OBD-II Scanner
  • •Digital Multimeter
  • •Small Phillips and flathead screwdrivers
  • •Replacement key fob battery (CR2032)
  • •Vehicle owner's manual

Additional Information

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

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Keyless Entry System Issues in a 2020 Toyota Highlander

Tools Required

  • OBD-II Scanner
  • Digital Multimeter
  • Small Phillips and flathead screwdrivers
  • Replacement key fob battery (CR2032)
  • Vehicle owner's manual

Step 1: Check Key Fob Battery

  1. Remove the Key Fob: Use a small flathead screwdriver to gently pry open the key fob case.
  2. Inspect the Battery: Check the battery for corrosion or damage. If it looks worn, replace it with a new CR2032 battery.
  3. Test the Key Fob: After replacing the battery, test the key fob to see if it operates the locking/unlocking functions.

Step 2: Confirm Vehicle Settings

  1. Vehicle Settings Check: Ensure that the keyless entry feature is enabled in the vehicle settings. Refer to your owner's manual for details on how to access these settings through the infotainment system.

Step 3: Check for Interference

  1. Environment Check: Ensure that you are not in an area with high electromagnetic interference (e.g., near radio towers, large metal structures).
  2. Test with Another Key Fob: If available, test another key fob with the vehicle to determine if the problem is with the key fob or the vehicle.

Step 4: OBD-II Scanning

  1. Connect OBD-II Scanner: Plug the OBD-II scanner into the vehicle's diagnostic port (usually located under the dashboard).
  2. Scan for Codes: Retrieve any trouble codes related to the keyless entry system. Note any relevant codes for further diagnosis.

Step 5: Inspect Keyless Entry Sensors

  1. Visual Inspection: Check the door handle sensors and antennae for any physical damage or obstructions.
  2. Test Sensor Functionality: Use the digital multimeter to check the continuity of the door handle sensors.
Repair Instructions

If Key Fob Battery Replacement Doesn't Work:

  1. Reprogram the Key Fob:

    • With the key fob in the vehicle, insert the key into the ignition.
    • Turn the ignition on and off without starting the engine. Do this five times in quick succession.
    • On the fifth turn, leave the key in the "ON" position and press any button on the key fob. You should hear a confirmation beep.
    • Repeat this process for any additional key fobs.

  2. Replace the Keyless Entry Module (if needed):

    • Locate the Module: The keyless entry module is usually located under the dash or near the steering column.
    • Remove the Dashboard Cover: Use Phillips screwdrivers to remove screws and gently pry off any plastic covers.
    • Disconnect the Module: Unplug the wiring harness from the module.
    • Install New Module: Plug in the new keyless entry module and reassemble the dashboard.

If Sensors Are Faulty:

  1. Replace Door Handle Sensors:
    • Remove Door Panel: Use a flathead screwdriver to pry off the door panel clips and remove screws.
    • Access the Sensor: Locate the door handle sensor wire harness.
    • Disconnect and Replace: Unplug the faulty sensor and replace it with a new one.
    • Reassemble the Door Panel: Reattach the door panel clips and screws.
Final Steps
  • Test the System: After completing repairs, test the keyless entry system to ensure it operates correctly.
  • Clear Diagnostic Codes: If you used an OBD-II scanner, clear any trouble codes from the system.
  • Recheck Settings: Confirm that all settings related to the keyless entry are properly configured.
Conclusion

If the keyless entry system still does not function correctly after all these steps, it may require further diagnosis by a professional technician or Toyota dealership, especially if there are advanced electrical issues or software problems involved.