how to fix the keyless entry not working on Toyota Highlander Fourth Generation (2020-present)

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

536 words

Problem Statement

Learn how to diagnose and fix keyless entry issues on Toyota Highlander (2020-present). Step-by-step guide with symptoms, diagnostic steps, and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shorts.

Symptoms

•Key fob does not unlock or lock the doors.
•Check for potential warning lights on the dashboard related to the keyless entry system.
•The vehicle does not respond when the key fob is pressed.
•Reduced range of key fob operation.
•Key fob buttons feel unresponsive or stuck.

Diagnostic Steps

1
Check the battery in the key fob and replace it if necessary.
2
Verify that the vehicle is in an area without interference from other electronic devices.
3
Inspect the key fob for physical damage or water exposure.
4
Use an OBD-II scanner to check for any relevant fault codes related to the keyless entry system.
5
Test the keyless entry system from different distances to rule out range issues.
6
Ensure that the vehicle's doors and trunk are fully closed and that no obstructions are present.

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
•OBD-II scanner
•Multimeter

Parts Required

•Key fob battery (CR2032)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the battery in the key fob and replace it if necessary.
2
Verify that the vehicle is in an area without interference from other electronic devices.
3
Inspect the key fob for physical damage or water exposure.
4
Use an OBD-II scanner to check for any relevant fault codes related to the keyless entry system.
5
Test the keyless entry system from different distances to rule out range issues.
6
Ensure that the vehicle's doors and trunk are fully closed and that no obstructions are present.

Solution

1. Preparation

Gather necessary tools and parts.
Wear gloves for safety.
Disconnect the vehicle battery to avoid any electrical shorts during repairs.

2. Replace Key Fob Battery

Open the key fob using a small flathead screwdriver.
Remove the old battery (usually a CR2032) from the fob.
Insert the new battery with the correct polarity (+ side facing up).
Snap the fob back together securely.

3. Reprogram Key Fob (if necessary)

Enter the vehicle and close all doors.
Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Turn the key back to the "OFF" position and remove it.
Press and hold the "LOCK" button on the key fob for 5-10 seconds.
Repeat this process for all key fobs to be programmed.
Turn the ignition back to the "ON" position to complete the programming.

4. Inspect Keyless Entry Antenna

Locate the keyless entry antenna, typically found near the front windshield or under the dashboard.
Inspect the wiring for any signs of damage or disconnection.
If necessary, reconnect any loose wires or replace damaged components.

5. Verify System Functionality

Reconnect the battery and test the keyless entry system.
Ensure that all key fobs are functioning as expected.