how to troubleshoot a key fob not working for Toyota Highlander XU70 (2020-Present)

Toyota Highlander XU70 (2020-Present)

Error Codes

30 minutes - 1 hour

Time

medium

Difficulty

high

Severity

3 min read

508 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 troubleshoot and fix a non-working key fob for the 2020-present Toyota Highlander XU70. Step-by-step guide with diagnostic and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes - 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' before performing key fob reprogramming.
•Do not attempt to start the vehicle while replacing the key fob battery.

Symptoms

•Key fob not responding to button presses
•Check engine light illuminated
•No sound or response from the vehicle when attempting to unlock
•Battery drain or dead battery in the fob
•Ignition not recognizing the key fob

Diagnostic Steps

1
Check the battery status of the key fob by replacing it with a new one.
2
Inspect the key fob for physical damage or signs of wear.
3
Attempt to reprogram the key fob to the vehicle.
4
Test the key fob with another vehicle to determine if the issue is with the fob or the vehicle.
5
Scan the vehicle's onboard diagnostic system for any error codes related to the keyless entry system.

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
•New battery (CR2032)

Parts Required

•Key fob battery (CR2032)

Related Faults

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Diagnostic Steps

1
Check the battery status of the key fob by replacing it with a new one.
2
Inspect the key fob for physical damage or signs of wear.
3
Attempt to reprogram the key fob to the vehicle.
4
Test the key fob with another vehicle to determine if the issue is with the fob or the vehicle.
5
Scan the vehicle's onboard diagnostic system for any error codes related to the keyless entry system.

Solution

1. Preparation

Gather tools: small flathead screwdriver, new battery (CR2032), OBD-II scanner (if needed).
Ensure the vehicle is in a safe location and the key fob battery is easily accessible.

2. Replace Key Fob Battery

Use the small flathead screwdriver to gently pry open the key fob casing.
Remove the old battery (CR2032) and replace it with the new one, ensuring the polarity (+/-) is correct.
Snap the key fob casing back together securely.

3. Reprogram Key Fob (if necessary)

Sit in the driver's seat and ensure all doors are closed.
Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Press the "Lock" button on the key fob within 5 seconds.
Turn the ignition off and then back to "ON" again, and repeat pressing the "Lock" button.
Turn the ignition to "OFF" and remove the key to complete the reprogramming.

4. Inspect Key Fob and Vehicle Components

Visually inspect the key fob for any cracks or water damage.
Check the vehicle's keyless entry receiver module located under the dashboard or in the rear compartment for loose connections or damage.
Ensure that the vehicle battery is fully charged and connections are clean.