How do I fix the key fob not working in my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

30 minutes

Time

easy

Difficulty

medium

Severity

3 min read

577 words

Problem Statement

Learn how to diagnose and fix the key fob not working issue in your 2020 Toyota Highlander with this step-by-step guide.

Affected Component

key fob

Estimated Time

30 minutes

Symptoms

•The key fob does not unlock or lock the doors.
•The engine fails to start when the fob is inside the vehicle.
•The LED indicator on the fob does not light up when pressed.

Diagnostic Steps

1
Check the Battery in the Key Fob
2
Inspect for Physical Damage
3
Reprogram the Key Fob
4
Test the Vehicle’s Keyless Entry System

Solution

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 flat-head screwdriver
•CR2032 battery (replacement)

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Solution

Key Fob Not Working in 2020 Toyota Highlander: Step-by-Step Guide

Step-by-Step Repair Instructions

Step 1: Check the Key Fob Battery

Open the Key Fob:
- Use a small flat-head screwdriver to gently pry apart the key fob. Look for a notch to insert the screwdriver.
Remove the Old Battery:
- Note the orientation of the battery (positive and negative sides).
- Carefully remove the old CR2032 battery.
Install the New Battery:
- Insert the new CR2032 battery in the same orientation as the old one.
Reassemble the Key Fob:
- Snap the two halves of the fob back together until they are securely closed.
Test the Fob:
- Stand close to the vehicle and try locking/unlocking the doors or starting the engine.

Step 2: Inspect for Physical Damage

Visual Inspection:
- Check the fob for any cracks, broken buttons, or water damage.
- If damaged, consider replacing the fob.

Step 3: Reprogram the Key Fob

Enter Programming Mode:
- Insert the key into the ignition and turn it to the “ON” position (not starting the engine).
- Turn the key to “OFF” and then back to “ON” five times within 10 seconds. The hazard lights will flash to confirm programming mode is active.
Press the Lock Button:
- Press the lock button on the key fob once. The hazard lights will flash again to confirm the fob is accepted.
Exit Programming Mode:
- Turn the ignition to “OFF” to exit programming mode.
Test the Key Fob:
- Stand close to the vehicle and try locking/unlocking or starting the engine.

Step 4: Test the Vehicle's Keyless Entry System

Use a Different Key Fob:
- If available, test another key fob to see if it works with your vehicle. If it does, the issue lies with your original key fob.
Consult Vehicle Manual:
- Refer to the owner’s manual for specific troubleshooting steps related to the keyless entry system.

Additional Considerations

Check for Interference: Ensure that there are no electronic devices nearby that may interfere with the signal.
Visit a Dealer: If all else fails, visit a Toyota dealership for professional diagnosis and potential replacement of the key fob or the keyless entry system.

Conclusion

Follow these steps systematically to diagnose and potentially fix the issue with your 2020 Toyota Highlander key fob. Most common issues can be resolved by replacing the battery or reprogramming the fob. If you encounter physical damage or persistent issues, seeking professional assistance is advisable.