Toyota Highlander Fourth Generation (2020-present) key fob not working how to fix

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

430 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix a non-working key fob for Toyota Highlander (2020-present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent shocks or shorts.

Symptoms

•Key fob buttons do not respond
•Vehicle will not unlock or lock remotely
•Engine does not start with key fob present
•Warning light on the dashboard indicating a key fob issue
•Reduced range of key fob operation

Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting the battery voltage.
2
Test the fob by pressing buttons while standing close to the vehicle.
3
Use an OBD-II scanner to check for any error codes related to the keyless entry or immobilizer system.
4
Inspect the vehicle's keyless entry receiver for any visible damage or loose connections.
5
Verify that the vehicle battery is charged and in good condition, as it may affect the fob's functionality.

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
•Wire connectors

Parts Required

•Key fob battery (CR2032 or as specified)
•Keyless entry receiver (if replacement is necessary)

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Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting the battery voltage.
2
Test the fob by pressing buttons while standing close to the vehicle.
3
Use an OBD-II scanner to check for any error codes related to the keyless entry or immobilizer system.
4
Inspect the vehicle's keyless entry receiver for any visible damage or loose connections.
5
Verify that the vehicle battery is charged and in good condition, as it may affect the fob's functionality.

Solution

1. Battery Replacement

Sub-steps:
1. Open the key fob using a small flathead screwdriver to pry it apart gently.
2. Remove the old battery (usually a CR2032) and dispose of it properly.
3. Insert a new battery, ensuring the positive (+) side is facing the correct direction.
4. Snap the key fob back together securely.

2. Reprogramming the Key Fob

Sub-steps:
1. Sit in the driver's seat and close all doors.
2. Insert the key into the ignition and turn it to the "On" position (do not start the engine).
3. Within 5 seconds, press the "Lock" button on the key fob for 1 second.
4. Turn the ignition to "Off" and then back to "On" twice within 10 seconds.
5. Press the "Lock" button again to finalize the programming.
6. Test the key fob to ensure it is functioning properly.

3. Repairing or Replacing the Receiver

Sub-steps:
1. Disconnect the vehicle battery to avoid electrical shorts.
2. Remove the dashboard panel to access the keyless entry receiver (follow specific service manual for your model).
3. Inspect the receiver for damage; if damaged, replace it with a new unit.
4. Reconnect all wiring harnesses and reassemble the dashboard.
5. Reconnect the vehicle battery and test the key fob operation.

Tools Required:

Small flathead screwdriver
OBD-II scanner
Wire connectors (if needed for receiver repair)

Parts Required:

Key fob battery (CR2032 or as specified)
Keyless entry receiver (if replacement is necessary)

Estimated Repair Time: 1-2 hours

Safety Warnings:

Disconnect the battery before working on electrical components to prevent shocks or shorts.