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

Toyota Highlander XU70 (2020-Present)

Error Codes

30 minutes

Time

medium

Difficulty

medium

Severity

3 min read

475 words

Problem Statement

Learn how to troubleshoot and fix a non-functioning 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

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle battery before working on the electrical components if necessary.

Symptoms

•Key fob buttons do not respond
•Indicator light on the key fob does not illuminate
•Vehicle does not recognize the fob when attempting to start
•Range for locking/unlocking is significantly reduced
•Remote start feature is inactive

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Inspect the key fob for physical damage or signs of wear.
3
Replace the key fob battery and test functionality.
4
Verify if other key fobs work with the vehicle to rule out vehicle issues.
5
Scan the vehicle’s computer 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

•Flathead screwdriver
•Multimeter

Parts Required

•Replacement battery (CR2032)

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Inspect the key fob for physical damage or signs of wear.
3
Replace the key fob battery and test functionality.
4
Verify if other key fobs work with the vehicle to rule out vehicle issues.
5
Scan the vehicle’s computer system for any error codes related to the keyless entry system.

Solution

1. Preparation

Gather necessary tools: flathead screwdriver, replacement battery (CR2032).
Ensure the vehicle is in a safe, well-lit area for working.
Disconnect the vehicle battery if needed for safety.

2. Open the Key Fob

Use a flathead screwdriver to gently pry open the key fob casing at the seam.
Carefully separate the two halves without damaging the clips.

3. Replace the Battery

Remove the old battery from the key fob holder.
Insert the new CR2032 battery, ensuring the positive (+) side is facing up.
Reassemble the key fob by aligning the two halves and pressing them together until they click.

4. Reprogramming the Key Fob (if necessary)

Enter the vehicle and close all doors.
Insert the key into the ignition and turn to the "ON" position (not starting the engine) and back to "OFF" five times within 10 seconds.
Leave the key in the "ON" position on the fifth cycle. The door locks should cycle to indicate programming mode.
Press any button on the key fob to program it. The door locks should cycle again.
Turn the ignition to "OFF" to exit programming mode.