how to fix my Toyota Highlander Fourth Generation (2020-present) that won't unlock with the key fob

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

524 words

Problem Statement

Learn how to diagnose and fix key fob issues for the 2020-present Toyota Highlander. 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 avoid shocks or shorts

Symptoms

•Key fob buttons do not respond when pressed
•Indicator light on key fob does not illuminate
•Vehicle does not respond to proximity unlocking
•Manual unlocking with the key blade is still functional
•Check engine light may be illuminated

Diagnostic Steps

1
Replace the key fob battery with a new one to rule out power issues
2
Test the key fob functionality using a multimeter to check for signal transmission
3
Inspect the vehicle’s receiver unit for any visible damage or disconnection
4
Check for any stored error codes using an OBD-II scanner
5
Verify the vehicle's central locking system by inspecting the door lock actuators and wiring

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
•Multimeter
•Socket set
•Screwdriver set
•Door panel removal tool

Parts Required

•Key fob battery (CR2032 or as needed)
•Door lock actuator (if applicable)

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Diagnostic Steps

1
Replace the key fob battery with a new one to rule out power issues
2
Test the key fob functionality using a multimeter to check for signal transmission
3
Inspect the vehicle’s receiver unit for any visible damage or disconnection
4
Check for any stored error codes using an OBD-II scanner
5
Verify the vehicle's central locking system by inspecting the door lock actuators and wiring

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is in a safe and secure area.
Disconnect the battery to prevent any electrical shorts during repair.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, replacement battery (CR2032 or as specified).
Remove the key fob casing using a flathead screwdriver.
Carefully take out the old battery and replace it with a new one, ensuring correct polarity.
Reassemble the key fob and test its functionality.

3. Inspect and Test Key Fob

Tools Required: Multimeter.
Set the multimeter to measure voltage and test the key fob buttons.
If the fob sends a signal, the problem may lie in the vehicle’s receiver.
If no signal is detected, consider reprogramming or replacing the key fob.

4. Check Vehicle’s Receiver Unit

Tools Required: Socket set, screwdriver set.
Remove the panel covering the receiver unit, typically located near the dashboard or under the steering column.
Inspect the receiver for burn marks, loose connections, or corrosion.
Reconnect any loose wiring and ensure the unit is securely mounted.

5. Inspect Door Lock Actuators

Tools Required: Socket set, door panel removal tool.
Remove the door panel to access the door lock actuator.
Inspect the actuator for any mechanical failure or electrical disconnection.
Replace the actuator if faulty, ensuring all connections are secure before reassembling the panel.