why does my Toyota Highlander XU70 (2020-Present) key fob not unlock the doors

Toyota Highlander XU70 (2020-Present)

Error Codes

30-60 minutes

Time

medium

Difficulty

medium

Severity

3 min read

544 words

Problem Statement

Learn how to diagnose and fix key fob issues for Toyota Highlander XU70. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

30-60 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in "Park" and the ignition is turned off while working on the key fob.

Symptoms

•Key fob buttons do not respond when pressed
•Doors do not unlock or lock when using the key fob
•Indicator light on the key fob does not illuminate when buttons are pressed
•Manual door lock operation works fine
•Key fob is physically damaged or shows signs of wear
•"Key Fob Battery Low" warning may appear on the dashboard

Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting the battery condition.
2
Test the key fob functionality with a spare key fob if available.
3
Inspect the key fob for physical damage or wear, including the buttons and casing.
4
Scan the vehicle’s onboard diagnostics system for any error codes related to the keyless entry system.
5
Verify that the vehicle's receiver is functioning by attempting to unlock/lock from a different distance and angle.
6
Check the vehicle battery voltage; a weak battery can affect electronic systems.

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

Parts Required

•CR2032 battery

Related Faults

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Symptoms

•Key fob buttons do not respond when pressed

•Doors do not unlock or lock when using the key fob

•Indicator light on the key fob does not illuminate when buttons are pressed

•Manual door lock operation works fine

•Key fob is physically damaged or shows signs of wear

•"Key Fob Battery Low" warning may appear on the dashboard

Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting the battery condition.
2
Test the key fob functionality with a spare key fob if available.
3
Inspect the key fob for physical damage or wear, including the buttons and casing.
4
Scan the vehicle’s onboard diagnostics system for any error codes related to the keyless entry system.
5
Verify that the vehicle's receiver is functioning by attempting to unlock/lock from a different distance and angle.
6
Check the vehicle battery voltage; a weak battery can affect electronic systems.

Solution

1. Battery Replacement

Open the Key Fob:
- Use a small flathead screwdriver to gently pry open the key fob casing.
- Tools Required: Small flathead screwdriver.
Remove the Old Battery:
- Carefully take out the old battery (typically a CR2032).
Install the New Battery:
- Insert a new battery, ensuring the positive (+) side faces the correct direction.
Reassemble the Key Fob:
- Snap the key fob casing back together until secure.

2. Key Fob Reprogramming (if necessary)

Enter the Vehicle:
- Sit inside the Toyota Highlander with all doors closed.
Turn on the Ignition:
- Insert the key into the ignition and turn it to the "On" position without starting the engine.
Press the Lock Button:
- Press the "Lock" button on the key fob for 1 second, then release.
Turn Off the Ignition:
- Turn the key back to the "Off" position.
Test the Key Fob:
- Try using the key fob to unlock the doors.

3. Receiver Check

Inspect the Antenna:
- Locate the keyless entry antenna (typically found near the front windshield) and ensure it is not obstructed or damaged.
Check Vehicle Electronics:
- If issues persist, have the vehicle's electronic systems inspected at a dealership or qualified service center.