why do the locks on my Toyota Highlander XU70 (2020-Present) not work with the key fob?

Toyota Highlander XU70 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

507 words

Problem Statement

Learn how to diagnose and fix key fob issues in Toyota Highlander XU70. 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 battery if working on electrical systems to prevent shorts.

Symptoms

•Key fob buttons are unresponsive
•Vehicle locks do not engage or disengage with key fob
•Check key fob battery warning on the dashboard
•Manual locking and unlocking works without issue
•LED indicator on key fob does not illuminate when buttons are pressed

Diagnostic Steps

1
Inspect the key fob battery for corrosion or damage.
2
Replace the battery in the key fob to see if it resolves the issue.
3
Check for any visible damage to the key fob casing or buttons.
4
Attempt to reprogram the key fob to the vehicle.
5
Use an OBD-II scanner to check for related error codes.
6
Inspect the vehicle's door lock actuators and wiring for faults.

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

•Key fob battery (CR2032)
•Small Phillips screwdriver
•Flathead screwdriver
•OBD-II scanner
•Multimeter

Parts Required

•Key fob battery (CR2032)
•Door lock actuator (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect the key fob battery for corrosion or damage.
2
Replace the battery in the key fob to see if it resolves the issue.
3
Check for any visible damage to the key fob casing or buttons.
4
Attempt to reprogram the key fob to the vehicle.
5
Use an OBD-II scanner to check for related error codes.
6
Inspect the vehicle's door lock actuators and wiring for faults.

Solution

1. Preparation

Tools Required: Key fob battery (CR2032), small Phillips screwdriver, flathead screwdriver (if needed).
Ensure the vehicle is in a secure position without any electrical loads.

2. Replace Key Fob Battery

Open the key fob using a small flathead screwdriver or a similar tool.
- Carefully pry apart the fob to avoid damaging the casing.
Remove the old battery.
- Note the orientation of the battery (positive side facing up).
Insert the new battery (CR2032) in the same orientation.
Reassemble the key fob by snapping the two halves back together.

3. Reprogram Key Fob

Enter the vehicle and close all doors.
Insert the key into the ignition and turn it to the "ON" position (do not start the engine) and then back to "OFF" five times within 10 seconds.
Open and close the driver’s door once to confirm programming mode is active (interior lights will flash).
Press any button on the key fob within 20 seconds to program it.
Turn the ignition back to the "ON" position to exit programming mode.

4. Inspect Door Lock Actuators

Remove the door panel of the driver’s side (use appropriate tools).
- Be cautious of clips and fasteners.
Locate the door lock actuator and inspect wiring connections.
Test the actuator with a multimeter to ensure it’s functioning properly.
Replace the door lock actuator if found faulty.