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

How do I address a malfunctioning 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
3 min read
578 words

Problem Statement

Learn how to diagnose and repair a malfunctioning key fob for your 2020 Toyota Highlander with step-by-step instructions.

Affected Component
key fob
Estimated Time
1 hour

Symptoms

  • •Inability to unlock/lock doors
  • •No response from vehicle
  • •Weak signal
  • •Warning lights
  • •Physical damage

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

  • •New CR2032 key fob battery
  • •Small flat-head screwdriver or a key fob opening tool
  • •OBD-II scanner (optional)
  • •Multimeter (optional for battery testing)

Additional Information

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

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Back to Generation
Addressing a Malfunctioning Key Fob for a 2020 Toyota Highlander
Tools Required
  • New CR2032 key fob battery
  • Small flat-head screwdriver or a key fob opening tool
  • OBD-II scanner (optional)
  • Multimeter (optional for battery testing)
Repair Instructions

Step 1: Replace the Key Fob Battery

  1. Open the Key Fob:
    • Use the flat-head screwdriver to gently pry apart the key fob casing at the seam.
  2. Remove the Old Battery:
    • Take out the old CR2032 battery and note the orientation (positive side facing up).
  3. Install the New Battery:
    • Insert the new CR2032 battery in the same orientation.
  4. Reassemble the Key Fob:
    • Snap the fob casing back together until securely closed.

Step 2: Reprogram the Key Fob

  1. Enter the Vehicle:
    • Close all doors and insert the key fob into the ignition (if applicable).
  2. Turn the Ignition On:
    • Turn the ignition to the "ON" position (do not start the engine) and then back to "OFF" five times within 10 seconds.
  3. Lock and Unlock:
    • Press the lock button on the key fob. If successful, the locks will cycle.
  4. Test the Key Fob:
    • Step outside the vehicle and test the lock/unlock and start functions.

Step 3: Check Vehicle Receiver (if necessary)

  1. Connect OBD-II Scanner:
    • Plug the OBD-II scanner into the vehicle’s OBD-II port (usually under the dashboard).
  2. Check for Codes:
    • Scan for codes related to the keyless entry system and note any findings.
  3. Clear Codes (if applicable):
    • If there are codes, clear them and check if the key fob functions properly afterward.
Final Checks
  • After completing the above steps, test the key fob in various locations to ensure it is functioning correctly.
  • If issues persist, consider visiting a Toyota dealership or a qualified automotive locksmith for further diagnostic services.

By following these steps, you should be able to address and potentially resolve the key fob malfunction for your 2020 Toyota Highlander.