how to resolve the key fob not working issue in Toyota Highlander XU70 (2020-Present)

Toyota Highlander XU70 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

482 words

Problem Statement

Learn how to diagnose and fix key fob issues in Toyota Highlander XU70 (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 vehicle's battery before working on electrical components to prevent shorts.

Symptoms

•Key fob buttons unresponsive
•Vehicle does not respond to key fob signals
•Warning light illuminated on the dashboard
•Reduced range of key fob operation
•Key fob battery low indicator (if applicable)

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter or by replacing the battery.
2
Inspect the key fob for physical damage or wear and tear.
3
Attempt to reprogram the key fob using the vehicle’s onboard programming mode.
4
Test the key fob with another vehicle of the same model to verify if the issue lies with the fob or the vehicle.
5
Check for any error codes using an OBD-II scanner that may indicate issues with the vehicle's 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

•Flat-head screwdriver
•Multimeter

Parts Required

•Key fob battery (CR2032 or similar)

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter or by replacing the battery.
2
Inspect the key fob for physical damage or wear and tear.
3
Attempt to reprogram the key fob using the vehicle’s onboard programming mode.
4
Test the key fob with another vehicle of the same model to verify if the issue lies with the fob or the vehicle.
5
Check for any error codes using an OBD-II scanner that may indicate issues with the vehicle's keyless entry system.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is in a well-ventilated area and the battery is disconnected if working on the vehicle's electrical system.

2. Replace Key Fob Battery

Open the key fob by using a small flat-head screwdriver to gently pry apart the two halves.
Remove the old battery and replace it with a new battery (typically a CR2032 or similar).
Ensure the battery is seated correctly with the positive side facing the correct direction.
Snap the key fob halves back together securely.

3. Reprogram the Key Fob

Sit in the vehicle with the doors closed and ensure all windows are up.
Insert the key into the ignition and turn it from "OFF" to "RUN" five times within 10 seconds.
Leave the key in the "RUN" position on the fifth turn; the locks will cycle to indicate programming mode.
Press any button on the key fob within 20 seconds to program it.
Turn the ignition to "OFF" to exit programming mode.

4. Check for Signal Interference

Ensure there are no electronic devices or other key fobs nearby that may cause interference.
Test the key fob again at varying distances from the vehicle.