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

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

610 words

Problem Statement

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

Affected Component

keyless entry system

Estimated Time

1-2 hours

Symptoms

•Key fob not responding
•Intermittent functionality
•Range issues
•Warning lights on dashboard
•Physical key not operating

Diagnostic Steps

1
Inspect Key Fob Battery
2
Check for Interference
3
Examine Keyless Entry Antenna
4
Use OBD-II Scanner

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
•Key fob battery replacement (CR2032)
•OBD-II Scanner
•Screwdriver set
•Owner’s manual

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Solution

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

The keyless entry system in the 2020 Toyota Highlander is designed for convenience, but like any electronic system, it can experience issues. Below are common problems, symptoms, diagnostic steps, and repair instructions.

Common Problems and Symptoms

Key Fob Not Responding
- Symptoms: The car does not unlock or lock when the key fob button is pressed, or the proximity feature does not work.
Intermittent Functionality
- Symptoms: The keyless entry works sporadically, sometimes functioning and other times not.
Range Issues
- Symptoms: The key fob only works when very close to the vehicle.
Warning Lights on Dashboard
- Symptoms: The "Key Fob Battery Low" warning or "Key Not Detected" light appears on the dashboard.
Physical Key Not Operating
- Symptoms: The physical key (if applicable) does not unlock the door.

Tools Required

Multimeter
Key fob battery replacement (CR2032)
OBD-II Scanner (for electronic diagnostics)
Screwdriver set
Owner’s manual

Step 1: Inspect Key Fob Battery

Open the Key Fob: Use a small screwdriver to carefully open the key fob casing.
Check Battery: Remove the battery and inspect for corrosion or damage. Replace the battery with a new CR2032 battery if necessary.
Test Functionality: Reassemble the key fob and test the lock/unlock functions.

Step 2: Check for Interference

Identify Interference Sources: Look for electronic devices nearby (cell phones, other key fobs, etc.) that may interfere with the signal.
Test in Different Locations: Try using the key fob in various locations to see if the problem persists.

Step 3: Examine Keyless Entry Antenna

Locate Antenna: Refer to the owner's manual to identify the antenna location (typically near the front windshield).
Visual Inspection: Check for any visible damage or disconnection.
Electrical Testing: Use a multimeter to check continuity and voltage at the antenna connection.

Step 4: Use OBD-II Scanner

Connect Scanner: Plug the OBD-II scanner into the vehicle's diagnostic port (usually located under the dashboard).
Check for Codes: Look for any error codes related to the keyless entry system (such as B1242 or B1243).
Clear Codes: If applicable, clear the codes and see if the issue returns.

Repair Instructions

Key Fob Battery Replacement

Replace Battery: Follow the steps in Step 1 to replace the key fob battery.
Re-test: After reassembly, test the keyless entry functionality.

Replacing Keyless Entry Antenna

Remove Trim Panel: If the antenna is faulty, remove the trim panel around the area of the antenna (usually requires a screwdriver).
Disconnect Antenna: Disconnect the antenna connector.
Install New Antenna: Replace with a new antenna part (check the Toyota parts catalog for the correct part number).
Reassemble: Reconnect and replace any trim panels removed.

Reprogramming Key Fob

Enter Programming Mode: Insert the key into the ignition and turn it to the "ON" position. Press the lock button on the key fob for about 5 seconds.
Test the Fob: Turn the ignition off, and attempt to use the key fob.
If Necessary: If programming fails, consult the dealer for advanced programming options.

Conclusion

The keyless entry system in the 2020 Toyota Highlander can exhibit various issues primarily related to the key fob or antenna. By following the diagnostic steps and repair instructions outlined, you can identify and resolve many common problems. Always refer to the vehicle's service manual for specific details and procedures unique to your model. If problems persist, consider consulting a certified Toyota technician for further assistance.